International Space Station
AMSL[5] | |
Apogee altitude | 422 km (262.2 mi) AMSL[5] |
---|---|
Orbital inclination | 51.64°[5] |
Orbital speed | 7.67 km/s; 27,600 km/h; 17,100 mph[6] |
Orbital period | 92.9 minutes[7] |
Orbits per day | 15.5[5] |
Orbit epoch | 16 August 16:19:30[8] |
Days in orbit | 26 years, 7 months, 28 days as of 18 July 2025 |
Days occupied | 24 years, 8 months, 16 days as of 18 July 2025 |
No. of orbits | 141,117 as of August 2023[update][8] |
Orbital decay | 2 km/month (1.2 mi/month) |
Statistics as of 22 December 2022 (unless noted otherwise) References:[4][5][9][10][11] | |
Configuration | |
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The International Space Station (ISS) is a large
The station is divided into two main sections: the Russian Orbital Segment (ROS), developed by Roscosmos, and the US Orbital Segment (USOS), built by NASA, ESA, JAXA, and CSA. A striking feature of the ISS is the Integrated Truss Structure, which connect the station’s vast system of solar panels and radiators to its pressurized modules. These modules support diverse functions, including scientific research, crew habitation, storage, spacecraft control, and airlock operations. The ISS has eight docking and berthing ports for visiting spacecraft. The station orbits the Earth at an average altitude of 400 kilometres (250 miles)[13] and circles the Earth in roughly 93 minutes, completing 15.5 orbits per day.[14]
The ISS programme combines two previously planned crewed Earth-orbiting stations: the United States' Space Station Freedom and the Soviet Union's Mir-2. The first ISS module was launched in 1998, with major components delivered by Proton and Soyuz rockets and the Space Shuttle. Long-term occupancy began on 2 November 2000, with the arrival of the Expedition 1 crew. Since then, the ISS has remained continuously inhabited for 24 years and 258 days, the longest continuous human presence in space. By March 2024[update], 279 individuals from 22 countries had visited the station.[15]
Future plans for the ISS include the addition of at least one module,
Conception
As the
One such concept was International Skylab, which proposed launching the backup
In the early 1980s,
In early 1985, science ministers from the European Space Agency (ESA) countries approved the Columbus programme, the most ambitious effort in space undertaken by that organization at the time. The plan spearheaded by Germany and Italy included a module which would be attached to Freedom, and with the capability to evolve into a full-fledged European orbital outpost before the end of the century.[20]
Increasing costs threw these plans into doubt in the early 1990s. Congress was unwilling to provide enough money to build and operate Freedom, and demanded NASA increase international participation to defray the rising costs or they would cancel the entire project outright.[21]
Simultaneously, the USSR was conducting planning for the
Purpose
The ISS was originally intended to be a laboratory, observatory, and factory while providing transportation, maintenance, and a low Earth orbit staging base for possible future missions to the Moon, Mars, and asteroids. However, not all of the uses envisioned in the initial memorandum of understanding between NASA and Roscosmos have been realised.[26] In the 2010 United States National Space Policy, the ISS was given additional roles of serving commercial, diplomatic,[27] and educational purposes.[28]
Scientific research
The ISS provides a platform to conduct scientific research, with power, data, cooling, and crew available to support experiments. Small uncrewed spacecraft can also provide platforms for experiments, especially those involving zero gravity and exposure to space, but space stations offer a long-term environment where studies can be performed potentially for decades, combined with ready access by human researchers.[29][30]
The ISS simplifies individual experiments by allowing groups of experiments to share the same launches and crew time. Research is conducted in a wide variety of fields, including
Perhaps the most notable ISS experiment is the Alpha Magnetic Spectrometer (AMS), which is intended to detect dark matter and answer other fundamental questions about our universe. According to NASA, the AMS is as important as the Hubble Space Telescope. Currently docked on station, it could not have been easily accommodated on a free flying satellite platform because of its power and bandwidth needs.[36][37] On 3 April 2013, scientists reported that hints of dark matter may have been detected by the AMS.[38][39][40][41][42][43] According to the scientists, "The first results from the space-borne Alpha Magnetic Spectrometer confirm an unexplained excess of high-energy positrons in Earth-bound cosmic rays".[44]
The space environment is hostile to life. Unprotected presence in space is characterised by an intense radiation field (consisting primarily of protons and other subatomic charged particles from the solar wind, in addition to cosmic rays), high vacuum, extreme temperatures, and microgravity.[45] Some simple forms of life called extremophiles,[46] as well as small invertebrates called tardigrades[47] can survive in this environment in an extremely dry state through desiccation.
Medical research improves knowledge about the effects of long-term space exposure on the human body, including
Medical studies are conducted aboard the ISS on behalf of the National Space Biomedical Research Institute (NSBRI). Prominent among these is the Advanced Diagnostic Ultrasound in Microgravity study in which astronauts perform ultrasound scans under the guidance of remote experts. The study considers the diagnosis and treatment of medical conditions in space. Usually, there is no physician on board the ISS and diagnosis of medical conditions is a challenge. It is anticipated that remotely guided ultrasound scans will have application on Earth in emergency and rural care situations where access to a trained physician is difficult.[50][51][52]
In August 2020, scientists reported that
Remote sensing of the Earth, astronomy, and deep space research on the ISS have significantly increased during the 2010s after the completion of the US Orbital Segment in 2011. Throughout the more than 20 years of the ISS program, researchers aboard the ISS and on the ground have examined aerosols, ozone, lightning, and oxides in Earth's atmosphere, as well as the Sun, cosmic rays, cosmic dust, antimatter, and dark matter in the universe. Examples of Earth-viewing remote sensing experiments that have flown on the ISS are the Orbiting Carbon Observatory 3, ISS-RapidScat, ECOSTRESS, the Global Ecosystem Dynamics Investigation, and the Cloud Aerosol Transport System. ISS-based astronomy telescopes and experiments include SOLAR, the Neutron Star Interior Composition Explorer, the Calorimetric Electron Telescope, the Monitor of All-sky X-ray Image (MAXI), and the Alpha Magnetic Spectrometer.[31][55]
Freefall


Researchers are investigating the effect of the station's near-weightless environment on the evolution, development, growth and internal processes of plants and animals. In response to some of the data, NASA wants to investigate
Investigating the physics of fluids in microgravity will provide better models of the behaviour of fluids. Because fluids can be almost completely combined in microgravity, physicists investigate fluids that do not mix well on Earth. Examining reactions that are slowed by low gravity and low temperatures will improve our understanding of superconductivity.[31]
The study of materials science is an important ISS research activity, with the objective of reaping economic benefits through the improvement of techniques used on Earth.[56] Other areas of interest include the effect of low gravity on combustion, through the study of the efficiency of burning and control of emissions and pollutants. These findings may improve knowledge about energy production and lead to economic and environmental benefits.[31]
Exploration

The ISS provides a location in the relative safety of low Earth orbit to test spacecraft systems that will be required for long-duration missions to the Moon and Mars. This provides experience in operations, maintenance, and repair and replacement activities on-orbit. This will help develop essential skills in operating spacecraft farther from Earth, reduce mission risks, and advance the capabilities of interplanetary spacecraft.[57] Referring to the MARS-500 experiment, a crew isolation experiment conducted on Earth, ESA states, "Whereas the ISS is essential for answering questions concerning the possible impact of weightlessness, radiation and other space-specific factors, aspects such as the effect of long-term isolation and confinement can be more appropriately addressed via ground-based simulations".[58] Sergey Krasnov, the head of human space flight programmes for Russia's space agency, Roscosmos, in 2011 suggested a "shorter version" of MARS-500 may be carried out on the ISS.[59]
In 2009, noting the value of the partnership framework itself, Sergey Krasnov wrote, "When compared with partners acting separately, partners developing complementary abilities and resources could give us much more assurance of the success and safety of space exploration. The ISS is helping further advance near-Earth space exploration and realisation of prospective programmes of research and exploration of the Solar system, including the Moon and Mars."
Education and cultural outreach

The ISS crew provides opportunities for students on Earth by running student-developed experiments, making educational demonstrations, allowing for student participation in classroom versions of ISS experiments, and directly engaging students using radio, and email.[64][65] ESA offers a wide range of free teaching materials that can be downloaded for use in classrooms.[66] In one lesson, students can navigate a 3D model of the interior and exterior of the ISS, and face spontaneous challenges to solve in real time.[67]
The
Cultural activities are another major objective of the ISS programme. Tetsuo Tanaka, the director of JAXA's Space Environment and Utilization Center, has said: "There is something about space that touches even people who are not interested in science."[72]
Amateur Radio on the ISS (ARISS) is a volunteer programme that encourages students worldwide to pursue careers in science, technology, engineering, and mathematics, through amateur radio communications opportunities with the ISS crew. ARISS is an international working group, consisting of delegations from nine countries including several in Europe, as well as Japan, Russia, Canada, and the United States. In areas where radio equipment cannot be used, speakerphones connect students to ground stations which then connect the calls to the space station.[73]
First Orbit is a 2011 feature-length documentary film about Vostok 1, the first crewed space flight around the Earth. By matching the orbit of the ISS to that of Vostok 1 as closely as possible, in terms of ground path and time of day, documentary filmmaker Christopher Riley and ESA astronaut Paolo Nespoli were able to film the view that Yuri Gagarin saw on his pioneering orbital space flight. This new footage was cut together with the original Vostok 1 mission audio recordings sourced from the Russian State Archive. Nespoli is credited as the director of photography for this documentary film, as he recorded the majority of the footage himself during Expedition 26/27.[74] The film was streamed in a global YouTube premiere in 2011 under a free licence through the website firstorbit.org.[75]
In May 2013, commander Chris Hadfield shot a music video of David Bowie's "Space Oddity" on board the station, which was released on YouTube.[76][77] It was the first music video filmed in space.[78]
In November 2017, while participating in Expedition 52/53 on the ISS, Paolo Nespoli made two recordings of his spoken voice (one in English and the other in his native Italian), for use on Wikipedia articles. These were the first content made in space specifically for Wikipedia.[79][80]
In November 2021, a virtual reality exhibit called The Infinite featuring life aboard the ISS was announced.[81]
International co-operation

Involving five space programs and fifteen countries,[82] the International Space Station is the most politically and legally complex space exploration programme in history.[82] The 1998 Space Station Intergovernmental Agreement sets forth the primary framework for international cooperation among the parties. A series of subsequent agreements govern other aspects of the station, ranging from jurisdictional issues to a code of conduct among visiting astronauts.[83]
Brazil was also invited to participate in the programme, the only developing country to receive such an invitation. Under the agreement framework, Brazil was to provide six pieces of hardware, and in exchange, would receive ISS utilization rights. However, Brazil was unable to deliver any of the elements due to a lack of funding and political priority within the country. Brazil officially dropped out of the ISS programme in 2007.[84][85]
Following the
On 26 July 2022, Yury Borisov, Rogozin's successor as head of Roscosmos, submitted to Russian President Putin plans for withdrawal from the programme after 2024.[89] However, Robyn Gatens, the NASA official in charge of the space station, responded that NASA had not received any formal notices from Roscosmos concerning withdrawal plans.[90]
Participating countries
Construction
Manufacturing

The International Space Station is a product of global collaboration, with its components manufactured across the world.
The modules of the Russian Orbital Segment, including Zarya and Zvezda, were produced at the Khrunichev State Research and Production Space Center in Moscow. Zvezda was initially manufactured in 1985 as a component for the Mir-2 space station, which was never launched.[91][92]
Much of the
The US Orbital Segment also hosts the
Assembly

The assembly of the International Space Station, a major endeavour in space architecture, began in November 1998.[9]
Modules in the Russian segment launched and docked autonomously, with the exception of Rassvet. Other modules and components were delivered by the Space Shuttle, which then had to be installed by astronauts either remotely using robotic arms or during spacewalks, more formally known as extra-vehicular activities (EVAs). By 5 June 2011 astronauts had made over 159 EVAs to add components to the station, totaling more than 1,000 hours in space.[95][96]

The beginning of the core of the ISS's tenure in orbit was the launch of the Russian-built
While the connection of two modules built on different continents, by nations that were once bitter rivals was a significant milestone, these two initial modules lacked life support systems and the ISS remained unmanned for the next two years. At the time, the Russian station Mir was still inhabited.
The turning point arrived in July 2000 with the launch of the Zvezda module. Equipped with living quarters and life-support systems, Zvezda enabled continuous human presence aboard the station. The first crew, Expedition 1, arrived that November aboard Soyuz TM-31.[97][98]
The ISS grew steadily over the following years, with modules delivered by both Russian rockets and the Space Shuttle.
Expedition 1 arrived midway between the Space Shuttle flights of missions
Tragedy struck in 2003 with the
Russia's new primary research module Nauka docked in July 2021,[102] along with the European Robotic Arm which can relocate itself to different parts of the Russian modules of the station.[103] Russia's latest addition, the Prichal module, docked in November 2021.[104]
As of June 2025, nasa.gov states that there are 43 different modules and elements installed on the ISS.[105]
Structure
The ISS functions as a modular space station, enabling the addition or removal of modules from its structure for increased adaptability.
-
Blueprint of ISS (as of 2018)
-
Rendering of ISS (as of 2023)
Below is a diagram of major station components. The Unity node joins directly to the Destiny laboratory; for clarity, they are shown apart. Similar cases are also seen in other parts of the structure.
Key to box background colors:
- Pressurised component, accessible by the crew without using spacesuits
- Docking/berthing port, pressurized when a visiting spacecraft is present
- Airlock, to move people or material between pressurized and unpressurized environment
- Unpressurised station superstructure
- Unpressurised component
- Temporarily defunct or non-commissioned component
- Former, no longer installed component
- Future, not yet installed component
Russian docking port | |||||||||||||||||||||||||||||||||||||||||||||||||||
Means of attachment of large payloads | Heat radiator | Poisk | Russian docking port | ||||||||||||||||||||||||||||||||||||||||||||||||
Portable workpost | |||||||||||||||||||||||||||||||||||||||||||||||||||
European Robotic Arm | Solar array | Zvezda | Solar array | ||||||||||||||||||||||||||||||||||||||||||||||||
Solar array | Nauka | Solar array | Pirs [a] | Russian docking port | |||||||||||||||||||||||||||||||||||||||||||||||
Russian docking port | Experiment airlock | ||||||||||||||||||||||||||||||||||||||||||||||||||
Russian docking port | Prichal | Russian docking port | |||||||||||||||||||||||||||||||||||||||||||||||||
Russian docking port | Russian docking port | ||||||||||||||||||||||||||||||||||||||||||||||||||
Solar array[b] | Zarya | Solar array[b] | |||||||||||||||||||||||||||||||||||||||||||||||||
Russian docking port | Rassvet | ||||||||||||||||||||||||||||||||||||||||||||||||||
iROSA | iROSA | iROSA | iROSA | ||||||||||||||||||||||||||||||||||||||||||||||||
Solar array | |||||||||||||||||||||||||||||||||||||||||||||||||||
Z1 truss | ELC 3 | ||||||||||||||||||||||||||||||||||||||||||||||||||
P5/6 Truss | |||||||||||||||||||||||||||||||||||||||||||||||||||
ESP 3 | ELC 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||
Canadarm2 robotic arm | |||||||||||||||||||||||||||||||||||||||||||||||||||
Solar array | |||||||||||||||||||||||||||||||||||||||||||||||||||
iROSA | iROSA | iROSA | iROSA | ||||||||||||||||||||||||||||||||||||||||||||||||
PMA 1 | BEAM | ||||||||||||||||||||||||||||||||||||||||||||||||||
Bishop airlock | |||||||||||||||||||||||||||||||||||||||||||||||||||
Cupola | |||||||||||||||||||||||||||||||||||||||||||||||||||
Cargo spacecraft berthing port | |||||||||||||||||||||||||||||||||||||||||||||||||||
Leonardo | |||||||||||||||||||||||||||||||||||||||||||||||||||
ESP-1 | Destiny | ||||||||||||||||||||||||||||||||||||||||||||||||||
PMA / IDA docking port | |||||||||||||||||||||||||||||||||||||||||||||||||||
Kibō robotic arm | |||||||||||||||||||||||||||||||||||||||||||||||||||
External payloads | Kibō external platform | ||||||||||||||||||||||||||||||||||||||||||||||||||
Cargo spacecraft berthing port | |||||||||||||||||||||||||||||||||||||||||||||||||||
PMA / IDA docking port | |||||||||||||||||||||||||||||||||||||||||||||||||||
Pressurised modules
Zarya

Zarya (Russian: Заря, lit. 'Sunrise'[c]), also known as the Functional Cargo Block (Russian: Функционально-грузовой блок), was the inaugural component of the ISS. Launched in 1998, it initially served as the ISS's power source, storage, propulsion, and guidance system. As the station has grown, Zarya's role has transitioned primarily to storage, both internally and in its external fuel tanks.[107]
A descendant of the TKS spacecraft used in the Salyut programme, Zarya was built in Russia but is owned by the United States. Its name symbolizes the beginning of a new era of international space cooperation.[108]
Unity

Unity, also known as Node 1, is the inaugural U.S.-built component of the ISS.
Zvezda

Zvezda (Russian: Звезда, lit. 'star') launched in July 2000, is the core of the
A descendant of the Salyut programme's DOS spacecraft, Zvezda was built by
Destiny

The Destiny laboratory is the primary research facility for U.S. experiments on the ISS. NASA's first permanent orbital research station since Skylab, the module was built by Boeing and launched aboard Space Shuttle Atlantis during STS-98. Attached to Unity over a period of five days in February 2001, Destiny has been a hub for scientific research ever since.[116][117][118]
Within Destiny, astronauts conduct experiments in fields such as medicine, engineering, biotechnology, physics, materials science, and Earth science. Researchers worldwide benefit from these studies. The module also houses life support systems, including the
Quest Joint Airlock

The Quest Joint Airlock enables extravehicular activities (EVAs) using either the U.S. Extravehicular Mobility Unit (EMU) or the Russian Orlan space suit.[120]
Before its installation, conducting EVAs from the ISS was challenging due to a variety of system and design differences. Only the Orlan suit could be used from the Transfer Chamber on the Zvezda module (which was not a purpose-built airlock) and the EMU could only be used from the airlock on a visiting Space Shuttle, which could not accommodate the Orlan.[121]
Launched aboard Space Shuttle Atlantis during STS-104 in July 2001 and attached to the Unity module, Quest is a 6.1-metre-long (20 ft), 4.0-metre-wide (13 ft) structure built by Boeing.[122] It houses the crew airlock for astronaut egress, an equipment airlock for suit storage, and has facilities to accommodate astronauts during their overnight pre-breathe procedures to prevent decompression sickness.[121]
The crew airlock, derived from the Space Shuttle, features essential equipment like lighting, handrails, and an Umbilical Interface Assembly (UIA) that provides life support and communication systems for up to two spacesuits simultaneously. These can be either two EMUs, two Orlan suits, or one of each design.
Poisk

Poisk (Russian: По́иск, lit. 'Search'), also known as the Mini-Research Module 2 (Russian: Малый исследовательский модуль 2), serves as both a secondary airlock on the Russian segment of the ISS and supports docking for Soyuz and Progress spacecraft, facilitates propellant transfers from the latter.
Poisk provides facilities to maintain Orlan spacesuits and is equipped with two inward-opening hatches, a design change from Mir, which encountered a dangerous situation caused by an outward-opening hatch that opened too quickly because of a small amount of air pressure remaining in the airlock.[126] Since the departure of Pirs in 2021, it's become the sole airlock on the Russian segment.
Harmony

Harmony, or Node 2, is the central connecting hub of the US segment of the ISS, linking the U.S., European, and Japanese laboratory modules. It's also been called the "utility hub" of the ISS as it provides essential power, data, and life support systems. The module also houses sleeping quarters for four crew members.[127]
Launched on 23 October 2007 aboard Space Shuttle Discovery on STS-120,[128][129] Harmony was initially attached to the Unity[130][131] before being relocated to its permanent position at the front of the Destiny laboratory on 14 November 2007.[132] This expansion added significant living space to the ISS, marking a key milestone in the construction of the U.S. segment.
Tranquility

Tranquility, also known as Node 3, is a module of the ISS. It contains environmental control systems,
The European Space Agency and the Italian Space Agency had Tranquility manufactured by Thales Alenia Space. A ceremony on 20 November 2009 transferred ownership of the module to NASA.[133] On 8 February 2010, NASA launched the module on the Space Shuttle's STS-130 mission.
Columbus

Columbus is a science laboratory that is part of the ISS and is the largest single contribution to the station made by the European Space Agency.
Like the Harmony and Tranquility modules, the Columbus laboratory was constructed in
The European Space Agency has spent €1.4 billion (about US$1.6 billion) on building Columbus, including the experiments it carries and the ground control infrastructure necessary to operate them.[134]
Kibō

Kibō (Japanese: きぼう; lit. 'hope'), also known as the Japanese Experiment Module, is Japan's research facility on the ISS. It is the largest single module on the ISS, consisting of a pressurized lab, an exposed facility for conducting experiments in the space environment, two storage compartments, and a robotic arm. Attached to the Harmony module, Kibō was assembled in space over three Space Shuttle missions: STS-123, STS-124 and STS-127.[135]
Cupola

The Cupola is an
Rassvet

Rassvet (Russian: Рассвет, lit. 'first light'), also known as the Mini-Research Module 1 (Russian: Малый исследовательский модуль 1) and formerly known as the Docking Cargo Module is primarily used for cargo storage and as a docking port for visiting spacecraft on the Russian segment of the ISS. Rassvet replaced the cancelled Docking and Storage Module and used a design largely based on the Mir Docking Module built in 1995.
Rassvet was delivered in on 14 May 2010 Space Shuttle Atlantis on STS-132 in exchange for the Russian Proton delivery of the US-funded Zarya module in 1998.[137] Rassvet was attached to Zarya shortly thereafter.[138]
Leonardo

The Leonardo Permanent Multipurpose Module (PMM) is a module of the International Space Station. It was flown into space aboard the Space Shuttle on STS-133 on 24 February 2011 and installed on 1 March. Leonardo is primarily used for storage of spares, supplies and waste on the ISS, which was until then stored in many different places within the space station. It is also the personal hygiene area for the astronauts who live in the US Orbital Segment. The Leonardo PMM was a Multi-Purpose Logistics Module (MPLM) before 2011, but was modified into its current configuration. It was formerly one of two MPLM used for bringing cargo to and from the ISS with the Space Shuttle. The module was named for Italian polymath Leonardo da Vinci.
Bigelow Expandable Activity Module

The Bigelow Expandable Activity Module (BEAM) is an experimental expandable space station module developed by Bigelow Aerospace, under contract to NASA, for testing as a temporary module on the International Space Station (ISS) from 2016 to at least 2020. It arrived at the ISS on 10 April 2016,[139] was berthed to the station on 16 April at Tranquility Node 3, and was expanded and pressurized on 28 May 2016. In December 2021, Bigelow Aerospace conveyed ownership of the module to NASA, as a result of Bigelow's cessation of activity.[140]
International Docking Adapters
The
Two International Docking Adapters are currently installed aboard the Station. Originally, IDA-1 was planned to be installed on PMA-2, located at Harmony's forward port, and IDA-2 would be installed on PMA-3 at Harmony's zenith. After IDA 1 was destroyed in a launch incident, IDA-2 was installed on PMA-2 on 19 August 2016,[141] while IDA-3 was later installed on PMA-3 on 21 August 2019.[142]
Bishop Airlock Module

The NanoRacks Bishop Airlock Module is a
Nauka

Nauka (Russian: Наука, lit. 'Science'), also known as the Multipurpose Laboratory Module, Upgrade (Russian: Многоцелевой лабораторный модуль, усоверше́нствованный), is a Roscosmos-funded component of the ISS that was launched on 21 July 2021, 14:58 UTC. In the original ISS plans, Nauka was to use the location of the Docking and Stowage Module (DSM), but the DSM was later replaced by the Rassvet module and moved to Zarya's nadir port. Nauka was successfully docked to Zvezda's nadir port on 29 July 2021, 13:29 UTC, replacing the Pirs module.
It had a temporary docking adapter on its nadir port for crewed and uncrewed missions until Prichal arrival, where just before its arrival it was removed by a departing Progress spacecraft.[147]
Prichal
Prichal (Russian: Причал, lit. 'pier') is a 4-tonne (8,800 lb) spherical module that serves as a docking hub for the Russian segment of the ISS. Launched in November 2021, Prichal provides additional docking ports for Soyuz and Progress spacecraft, as well as potential future modules. Prichal features six docking ports: forward, aft, port, starboard, zenith, and nadir. One of these ports, equipped with an active hybrid docking system, enabled it to dock with the Nauka module. The remaining five ports are passive hybrids, allowing for docking of Soyuz, Progress, and heavier modules, as well as future spacecraft with modified docking systems. As of 2024, the forward, aft, port and starboard docking ports remain covered. Prichal was initially intended to be an element of the now canceled Orbital Piloted Assembly and Experiment Complex.[148][149][150][151]
Unpressurised elements
The ISS has a large number of external components that do not require pressurisation. The largest of these is the Integrated Truss Structure (ITS), to which the station's main solar arrays and thermal radiators are mounted.[152] The ITS consists of ten separate segments forming a structure 108.5 metres (356 ft) long.[9]
The station was intended to have several smaller external components, such as six robotic arms, three
There are also smaller exposure facilities mounted directly to laboratory modules; the Kibō
The commercial
MLM outfittings
In May 2010, equipment for Nauka was launched on STS-132 (as part of an agreement with NASA) and delivered by Space Shuttle Atlantis. Weighing 1.4 metric tons, the equipment was attached to the outside of Rassvet (MRM-1). It included a spare elbow joint for the European Robotic Arm (ERA) (which was launched with Nauka) and an ERA-portable workpost used during EVAs, as well as RTOd add-on heat radiator and internal hardware alongside the pressurized experiment airlock.[171]
The RTOd radiator adds additional cooling capability to Nauka, which enables the module to host more scientific experiments.[171]
The ERA was used to remove the RTOd radiator from Rassvet and transferred over to Nauka during VKD-56 spacewalk. Later it was activated and fully deployed on VKD-58 spacewalk.[172] This process took several months. A portable work platform was also transferred over in August 2023 during VKD-60 spacewalk, which can attach to the end of the ERA to allow cosmonauts to "ride" on the end of the arm during spacewalks.[173][174] However, even after several months of outfitting EVAs and RTOd heat radiator installation, six months later, the RTOd radiator malfunctioned before active use of Nauka (the purpose of RTOd installation is to radiate heat from Nauka experiments). The malfunction, a leak, rendered the RTOd radiator unusable for Nauka. This is the third ISS radiator leak after Soyuz MS-22 and Progress MS-21 radiator leaks. If a spare RTOd is not available, Nauka experiments will have to rely on Nauka's main launch radiator and the module could never be used to its full capacity.[175][176]
Another MLM outfitting is a 4 segment external payload interface called means of attachment of large payloads (Sredstva Krepleniya Krupnogabaritnykh Obyektov, SKKO).[177] Delivered in two parts to Nauka by Progress MS-18 (LCCS part) and Progress MS-21 (SCCCS part) as part of the module activation outfitting process.[178][179][180][181] It was taken outside and installed on the ERA aft facing base point on Nauka during the VKD-55 spacewalk.[182][183][184][185]
Robotic arms and cargo cranes
The Integrated Truss Structure (ITS) serves as a base for the station's primary remote manipulator system, the Mobile Servicing System (MSS), which is composed of three main components:
- Canadarm2, the largest robotic arm on the ISS, has a mass of 1,800 kilograms (4,000 lb) and is used to: dock and manipulate spacecraft and modules on the USOS; hold crew members and equipment in place during EVAs; and move Dextre to perform tasks.[186]
- Dextre is a 1,560 kg (3,440 lb) robotic manipulator that has two arms and a rotating torso, with power tools, lights, and video for replacing orbital replacement units (ORUs) and performing other tasks requiring fine control.[187]
- The Mobile Base System (MBS) is a platform that rides on rails along the length of the station's main truss, which serves as a mobile base for Canadarm2 and Dextre, allowing the robotic arms to reach all parts of the USOS.[188]
A
Japan's
The European Robotic Arm, which will service the ROS, was launched alongside the Nauka module.[191] The ROS does not require spacecraft or modules to be manipulated, as all spacecraft and modules dock automatically and may be discarded the same way. Crew use the two Strela (Russian: Стрела́, lit. 'Arrow') cargo cranes during EVAs for moving crew and equipment around the ROS. Each Strela crane has a mass of 45 kg (99 lb).
Former module
Pirs
Pirs (Russian: Пирс, lit. 'Pier') was launched on 14 September 2001, as ISS Assembly Mission 4R, on a Russian Soyuz-U rocket, using a modified
Planned components
Axiom segment
In January 2020, NASA awarded
As of December 2024[update], Axiom Space expects to launch one module, the Payload Power Thermal Module (PPTM), to the ISS no earlier than 2027.[196] PPTM is expected to remain at the ISS until the launch of Axiom's Habitat One (Hab-1) module about one year later, after which it will detach from the ISS to join with Hab-1.[196]
US Deorbit Vehicle
The
Cancelled components
Several modules developed or planned for the station were cancelled over the course of the ISS programme. Reasons include budgetary constraints, the modules becoming unnecessary, and station redesigns after the 2003 Columbia disaster. The US Centrifuge Accommodations Module would have hosted science experiments in varying levels of artificial gravity.[199] The US Habitation Module would have served as the station's living quarters. Instead, the living quarters are now spread throughout the station.[200] The US Interim Control Module and ISS Propulsion Module would have replaced the functions of Zvezda in case of a launch failure.[201] Two Russian Research Modules were planned for scientific research.[202] They would have docked to a Russian Universal Docking Module.[203] The Russian Science Power Platform would have supplied power to the Russian Orbital Segment independent of the ITS solar arrays.
Science Power Modules 1 and 2 (Repurposed Components)
Science Power Module 1 (SPM-1, also known as NEM-1) and Science Power Module 2 (SPM-2, also known as NEM-2) are modules that were originally planned to arrive at the ISS no earlier than 2024, and dock to the Prichal module, which is docked to the Nauka module.[151][204] In April 2021, Roscosmos announced that NEM-1 would be repurposed to function as the core module of the proposed Russian Orbital Service Station (ROSS), launching no earlier than 2027[205] and docking to the free-flying Nauka module.[206][207] NEM-2 may be converted into another core "base" module, which would be launched in 2028.[208]
Xbase
Designed by Bigelow Aerospace. In August 2016, Bigelow negotiated an agreement with NASA to develop a full-size ground prototype Deep Space Habitation based on the B330 under the second phase of Next Space Technologies for Exploration Partnerships. The module was called the Expandable Bigelow Advanced Station Enhancement (XBASE), as Bigelow hoped to test the module by attaching it to the International Space Station. However, in March 2020, Bigelow laid off all 88 of its employees, and as of February 2024[update] the company remains dormant and is considered defunct,[209][210] making it appear unlikely that the XBASE module will ever be launched.
Nautilus-X Centrifuge Demonstration
A proposal was put forward in 2011 for a first in-space demonstration of a sufficiently scaled centrifuge for artificial partial-g gravity effects. It was designed to become a sleep module for the ISS crew. The project was cancelled in favour of other projects due to budget constraints.[211]
Onboard systems
Life support
The critical systems are the atmosphere control system, the water supply system, the food supply facilities, the sanitation and hygiene equipment, and fire detection and suppression equipment. The Russian Orbital Segment's life support systems are contained in the Zvezda service module. Some of these systems are supplemented by equipment in the USOS. The Nauka laboratory has a complete set of life support systems.
Atmospheric control systems

The atmosphere on board the ISS is similar to
The
Part of the ROS atmosphere control system is the oxygen supply. Triple-redundancy is provided by the Elektron unit, solid fuel generators, and stored oxygen. The primary supply of oxygen is the Elektron unit which produces O2 and H2 by electrolysis of water and vents H2 overboard. The 1 kW (1.3 hp) system uses approximately one litre of water per crew member per day. This water is either brought from Earth or recycled from other systems. Mir was the first spacecraft to use recycled water for oxygen production. The secondary oxygen supply is provided by burning oxygen-producing Vika cartridges (see also ISS ECLSS). Each 'candle' takes 5–20 minutes to decompose at 450–500 °C (842–932 °F), producing 600 litres (130 imp gal; 160 US gal) of O2. This unit is manually operated.[218]
The US Orbital Segment (USOS) has redundant supplies of oxygen, from a pressurised storage tank on the Quest airlock module delivered in 2001, supplemented ten years later by ESA-built Advanced Closed-Loop System (ACLS) in the Tranquility module (Node 3), which produces O2 by electrolysis.[219] Hydrogen produced is combined with carbon dioxide from the cabin atmosphere and converted to water and methane.
Power and thermal control
Double-sided solar arrays provide electrical power to the ISS. These bifacial cells collect direct sunlight on one side and light reflected off from the Earth on the other, and are more efficient and operate at a lower temperature than single-sided cells commonly used on Earth.[220]
The Russian segment of the station, like most spacecraft, uses 28 V low voltage DC from two rotating solar arrays mounted on Zvezda. The USOS uses 130–180 V DC from the USOS PV array. Power is stabilised and distributed at 160 V DC and converted to the user-required 124 V DC. The higher distribution voltage allows smaller, lighter conductors, at the expense of crew safety. The two station segments share power with converters.
The USOS solar arrays are arranged as four wing pairs, for a total production of 75 to 90 kilowatts.[4] These arrays normally track the Sun to maximise power generation. Each array is about 375 m2 (4,036 sq ft) in area and 58 m (190 ft) long. In the complete configuration, the solar arrays track the Sun by rotating the alpha gimbal once per orbit; the beta gimbal follows slower changes in the angle of the Sun to the orbital plane. The Night Glider mode aligns the solar arrays parallel to the ground at night to reduce the significant aerodynamic drag at the station's relatively low orbital altitude.[221]
The station originally used rechargeable nickel–hydrogen batteries (NiH2) for continuous power during the 45 minutes of every 90-minute orbit that it is eclipsed by the Earth. The batteries are recharged on the day side of the orbit. They had a 6.5-year lifetime (over 37,000 charge/discharge cycles) and were regularly replaced over the anticipated 20-year life of the station.[222] Starting in 2016, the nickel–hydrogen batteries were replaced by lithium-ion batteries, which are expected to last until the end of the ISS program.[223]
The station's large solar panels generate a high potential voltage difference between the station and the ionosphere. This could cause arcing through insulating surfaces and sputtering of conductive surfaces as ions are accelerated by the spacecraft plasma sheath. To mitigate this, plasma contactor units create current paths between the station and the ambient space plasma.[224]

The station's systems and experiments consume a large amount of electrical power, almost all of which is converted to heat. To keep the internal temperature within workable limits, a passive thermal control system (PTCS) is made of external surface materials, insulation such as MLI, and heat pipes. If the PTCS cannot keep up with the heat load, an External Active Thermal Control System (EATCS) maintains the temperature. The EATCS consists of an internal, non-toxic, water coolant loop used to cool and dehumidify the atmosphere, which transfers collected heat into an external liquid ammonia loop. From the heat exchangers, ammonia is pumped into external radiators that emit heat as infrared radiation, then the ammonia is cycled back to the station.[225] The EATCS provides cooling for all the US pressurised modules, including Kibō and Columbus, as well as the main power distribution electronics of the S0, S1 and P1 trusses. It can reject up to 70 kW. This is much more than the 14 kW of the Early External Active Thermal Control System (EEATCS) via the Early Ammonia Servicer (EAS), which was launched on STS-105 and installed onto the P6 Truss.[226]
Communications and computers
The ISS relies on various radio communication systems to provide telemetry and scientific data links between the station and mission control centres. Radio links are also used during rendezvous and docking procedures and for audio and video communication between crew members, flight controllers and family members. As a result, the ISS is equipped with internal and external communication systems used for different purposes.[227]
The Russian Orbital Segment primarily uses the Lira antenna mounted on Zvezda for direct ground communication.[64][228] It also had the capability to utilize the Luch data relay satellite system,[64] which was in a state of disrepair when the station was built,[64][229][230] but was restored to operational status in 2011 and 2012 with the launch of Luch-5A and Luch-5B.[231] Additionally, the Voskhod-M system provides internal telephone communications and VHF radio links to ground control.[232]
The
UHF radio is used by astronauts and cosmonauts conducting EVAs and other spacecraft that dock to or undock from the station.[64] Automated spacecraft are fitted with their own communications equipment; the ATV used a laser attached to the spacecraft and the Proximity Communications Equipment attached to Zvezda to accurately dock with the station.[235][236]
The US Orbital Segment of the ISS is equipped with approximately 100 commercial off-the-shelf laptops running Windows or Linux.[237] These devices are modified to use the station's 28V DC power system and with additional ventilation since heat generated by the devices can stagnate in the weightless environment. NASA prefers to keep a high commonality between laptops and spare parts are kept on the station so astronauts can repair laptops when needed.[238]
The laptops are divided into two groups: the Portable Computer System (PCS) and Station Support Computers (SSC).
PCS laptops run Linux and are used for connecting to the station's primary Command & Control computer (C&C MDM), which runs on Debian Linux,[239] a switch made from Windows in 2013 for reliability and flexibility.[240] The primary computer supervises the critical systems that keep the station in orbit and supporting life.[237] Since the primary computer has no display or keyboards, astronauts use a PCS laptop to connect as remote terminals via a USB to 1553 adapter.[241] The primary computer experienced failures in 2001,[242] 2007,[243] and 2017. The 2017 failure required a spacewalk to replace external components.[244]
SSC laptops are used for everything else on the station, including reviewing procedures, managing scientific experiments, communicating over e-mail or video chat, and for entertainment during downtime.
Operations
Expeditions
Each permanent crew is given an expedition number. Expeditions run up to six months, from launch until undocking, an 'increment' covers the same time period, but includes cargo spacecraft and all activities. Expeditions 1 to 6 consisted of three-person crews. After the destruction of NASA's Space Shuttle Columbia, Expeditions 7 to 12 were reduced to two-person "caretaker" crews who could maintain the station, because a larger crew could not be fully resupplied by the small Russian Progress cargo spacecraft.[249] After the Shuttle fleet returned to flight, three person crews also returned to the ISS beginning with Expedition 13. As the Shuttle flights expanded the station, crew sizes also expanded, eventually reaching six around 2010.[250][251] With the arrival of crew on larger US commercial spacecraft beginning in 2020,[252] crew size has been increased to seven, the number for which ISS was originally designed.[253][254]
Oleg Kononenko of Roscosmos holds the record for the longest time spent in space and at the ISS, accumulating nearly 1,111 days in space over the course of five long-duration missions on the ISS (Expedition 17, 30/31, 44/45, 57/58/59 and 69/70/71). He also served as commander three times (Expedition 31, 58/59 and 70/71).[255]
Peggy Whitson of NASA and Axiom Space has spent the most time in space of any American, accumulating over 675 days in space during her time on Expeditions 5, 16, and 50/51/52 and Axiom Mission 2.[256][257]
Private flights
Travellers who pay for their own passage into space are termed spaceflight participants by Roscosmos and NASA, and are sometimes referred to as "space tourists", a term they generally dislike.[d] As of June 2023[update], thirteen space tourists have visited the ISS; nine were transported to the ISS on Russian Soyuz spacecraft, and four were transported on American SpaceX Dragon 2 spacecraft. For one-tourist missions, when professional crews change over in numbers not divisible by the three seats in a Soyuz, and a short-stay crewmember is not sent, the spare seat is sold by MirCorp through Space Adventures. Space tourism was halted in 2011 when the Space Shuttle was retired and the station's crew size was reduced to six, as the partners relied on Russian transport seats for access to the station. Soyuz flight schedules increased after 2013, allowing five Soyuz flights (15 seats) with only two expeditions (12 seats) required.[265] The remaining seats were to be sold for around US$40 million each to members of the public who could pass a medical exam. ESA and NASA criticised private spaceflight at the beginning of the ISS, and NASA initially resisted training Dennis Tito, the first person to pay for his own passage to the ISS.[e]
Anousheh Ansari became the first self-funded woman to fly to the ISS as well as the first Iranian in space. Officials reported that her education and experience made her much more than a tourist, and her performance in training had been "excellent."[266] She did Russian and European studies involving medicine and microbiology during her 10-day stay. The 2009 documentary Space Tourists follows her journey to the station, where she fulfilled "an age-old dream of man: to leave our planet as a 'normal person' and travel into outer space."[267]
In 2008, spaceflight participant
After a 12-year hiatus, the first two wholly space tourism-dedicated private spaceflights to the ISS were undertaken.
Fleet operations
Various crewed and uncrewed spacecraft have supported the station's activities. Flights to the ISS include 37 Space Shuttle, 91 Progress,[f] 72 Soyuz, 5 ATV, 9 HTV, 2 Boeing Starliner, 48 SpaceX Dragon[g] and 20 Cygnus missions.[278]
There are currently eight docking ports for visiting spacecraft, with four additional ports installed but not yet put into service:[279]
- Harmony forward (with PMA 2 & IDA 2)
- Harmony zenith (with PMA 3 & IDA 3)
- Harmony nadir (CBM port)
- Unity nadir (CBM port)
- Prichal aft[h]
- Prichal forward[h]
- Prichal nadir
- Prichal port[h]
- Prichal starboard[h]
- Poisk zenith
- Rassvet nadir
- Zvezda aft
Forward ports are at the front of the station in its usual orientation and direction of travel. Aft is the opposite, at the rear. Nadir points toward Earth, while zenith points away from it. Port is to the left and starboard to the right when one's feet are toward Earth and one is facing forward, in the direction of travel.
Cargo spacecraft that will perform an orbital re-boost of the station will typically dock at an aft, forward or nadir-facing port.
Crewed
As of 26 June 2025[ref], a total of 288 individuals from 26 countries had visited the International Space Station (ISS), including both government-sponsored astronauts and privately funded spaceflight participants. The United States accounted for 169 of these visitors, followed by Russia with 63, Japan with 11, and Canada with 9. Italy had 6 visitors, while France and Germany had each sent 4. Saudi Arabia, Sweden, and the United Arab Emirates each had 2 individuals visit the ISS. One person had traveled to the ISS from each of the following countries: Belarus, Belgium, Brazil, Denmark, Hungary, India, Israel, Kazakhstan, Malaysia, the Netherlands, Poland, South Africa, South Korea, Spain, Turkey, and the United Kingdom.[280]
List of current crew members

Astronaut | Role | Agency | |
---|---|---|---|
Expedition 73 crew | |||
Takuya Onishi | Commander | JAXA
| |
Nichole Ayers | Flight Engineer | ![]() | |
Jonny Kim | Flight Engineer | ![]() | |
Anne McClain | Flight Engineer | ![]() | |
Kirill Peskov | Flight Engineer | ![]() | |
Sergey Ryzhikov | Flight Engineer | ![]() | |
Alexey Zubritsky | Flight Engineer | ![]() |
Uncrewed
Uncrewed spaceflights are made primarily to deliver cargo, however several Russian modules have also docked to the outpost following uncrewed launches. Resupply missions typically use the Russian
spacecraft.Currently docked/berthed

All dates are
Mission | Type | Spacecraft | Arrival | Departure | Port | |
---|---|---|---|---|---|---|
Progress MS-30 | ![]() |
Uncrewed | Progress MS No. 460 | 1 March 2025 | August 2025 | Zvezda aft |
Crew-10 | ![]() |
Crewed | Crew Dragon Endurance | 16 March 2025 | July 2025 | Harmony forward |
Soyuz MS-27 | ![]() |
Crewed | Soyuz MS No. 758 Favor | 8 April 2025 | 8 December 2025 | Prichal nadir |
Progress MS-31 | ![]() |
Uncrewed | Progress MS No. 461 | 5 July 2025 | December 2025 | Poisk zenith |
Scheduled missions
All dates are
Mission | Type | Spacecraft | Launch date[281] | Launch vehicle | Launch site | Launch provider | Docking/berthing port | |
---|---|---|---|---|---|---|---|---|
Crew-11 | ![]() |
Crewed | Crew Dragon Endeavour | 31 July 2025 | Falcon 9 | TBD | SpaceX | Harmony zenith |
CRS SpX-33 | ![]() |
Uncrewed | Cargo Dragon | August 2025 | Falcon 9 | TBD | SpaceX | Harmony forward |
Progress MS-32
|
![]() |
Uncrewed | Progress MS No. 462 | 11 September 2025 | Soyuz‑2.1a | Baikonur, Site 31/6 | Progress | Zvezda aft |
CRS NG-23
|
![]() |
Uncrewed | Cygnus | September 2025 | Falcon 9 | TBD | SpaceX | Harmony or Unity nadir |
SSC Demo-1 | ![]() |
Uncrewed | Dream Chaser Tenacity | Q3 2025 | Vulcan Centaur | Cape Canaveral, SLC‑41 | ULA | Harmony or Unity nadir |
HTV-X1 | ![]() |
Uncrewed | HTV-X | October 2025 | H3‑24L | Tanegashima, LA‑Y2 | JAXA | Harmony or Unity nadir |
Soyuz MS-28 | ![]() |
Crewed | Soyuz MS No. 759 Favor 2 | 27 November 2025 | Soyuz‑2.1a | Baikonur, Site 31/6 | Progress | Rassvet nadir |
Progress MS-33
|
![]() |
Uncrewed | Progress MS No. 463 | 19 December 2025 | Soyuz‑2.1a | Baikonur, Site 31/6 | Progress | Poisk zenith |
Docking and berthing of spacecraft

The Russian spacecraft and can autonomously rendezvous and dock with the station without human intervention. Once within approximately 200 kilometres (120 mi), the spacecraft begins receiving radio signals from the Kurs docking navigation system on the station. As the spacecraft nears the station, laser-based optical equipment precisely aligns the craft with the docking port and controls the final approach. While the crew on the ISS and spacecraft monitor the procedure, their role is primarily supervisory, with intervention limited to issuing abort commands in emergencies. Although initial development costs were substantial, the system's reliability and standardized components have yielded significant cost reductions for subsequent missions.[282]
The American SpaceX Dragon 2 cargo and crewed spacecraft can autonomously rendezvous and dock with the station without human intervention. However, on crewed Dragon missions, the astronauts have the capability to intervene and fly the vehicle manually.[283]

Other
Launch and docking windows
Prior to a spacecraft's docking to the ISS, navigation and attitude control (GNC) is handed over to the ground control of the spacecraft's country of origin. GNC is set to allow the station to drift in space, rather than fire its thrusters or turn using gyroscopes. The solar panels of the station are turned edge-on to the incoming spacecraft, so residue from its thrusters does not damage the cells. Before its retirement, Shuttle launches were often given priority over Soyuz, with occasional priority given to Soyuz arrivals carrying crew and time-critical cargoes, such as biological experiment materials.[284]
Repairs


Unexpected problems and failures have impacted the station's assembly time-line and work schedules leading to periods of reduced capabilities and, in some cases, could have forced abandonment of the station for safety reasons. Serious problems include an air leak from the USOS in 2004,
During STS-120 in 2007 and following the relocation of the P6 truss and solar arrays, it was noted during unfurling that the solar array had torn and was not deploying properly.[288] An EVA was carried out by Scott Parazynski, assisted by Douglas Wheelock. Extra precautions were taken to reduce the risk of electric shock, as the repairs were carried out with the solar array exposed to sunlight.[289] The issues with the array were followed in the same year by problems with the starboard Solar Alpha Rotary Joint (SARJ), which rotates the arrays on the starboard side of the station. Excessive vibration and high-current spikes in the array drive motor were noted, resulting in a decision to substantially curtail motion of the starboard SARJ until the cause was understood. Inspections during EVAs on STS-120 and STS-123 showed extensive contamination from metallic shavings and debris in the large drive gear and confirmed damage to the large metallic bearing surfaces, so the joint was locked to prevent further damage.[290][291] Repairs to the joints were carried out during STS-126 with lubrication and the replacement of 11 out of 12 trundle bearings on the joint.[292][293]
In September 2008, damage to the S1 radiator was first noticed in Soyuz imagery. The problem was initially not thought to be serious.[294] The imagery showed that the surface of one sub-panel had peeled back from the underlying central structure, possibly because of micro-meteoroid or debris impact. On 15 May 2009, the damaged radiator panel's ammonia tubing was mechanically shut off from the rest of the cooling system by the computer-controlled closure of a valve. The same valve was then used to vent the ammonia from the damaged panel, eliminating the possibility of an ammonia leak.[294] It is also known that a Service Module thruster cover struck the S1 radiator after being jettisoned during an EVA in 2008, but its effect, if any, has not been determined.
In the early hours of 1 August 2010, a failure in cooling Loop A (starboard side), one of two external cooling loops, left the station with only half of its normal cooling capacity and zero redundancy in some systems.[295][296][297] The problem appeared to be in the ammonia pump module that circulates the ammonia cooling fluid. Several subsystems, including two of the four CMGs, were shut down.
Planned operations on the ISS were interrupted through a series of EVAs to address the cooling system issue. A first EVA on 7 August 2010, to replace the failed pump module, was not fully completed because of an ammonia leak in one of four quick-disconnects. A second EVA on 11 August removed the failed pump module.[298][299] A third EVA was required to restore Loop A to normal functionality.[300][301]
The USOS's cooling system is largely built by the US company Boeing,[302] which is also the manufacturer of the failed pump.[295]
The four Main Bus Switching Units (MBSUs, located in the S0 truss), control the routing of power from the four solar array wings to the rest of the ISS. Each MBSU has two power channels that feed 160V DC from the arrays to two DC-to-DC power converters (DDCUs) that supply the 124V power used in the station. In late 2011, MBSU-1 ceased responding to commands or sending data confirming its health. While still routing power correctly, it was scheduled to be swapped out at the next available EVA. A spare MBSU was already on board, but a 30 August 2012 EVA failed to be completed when a bolt being tightened to finish installation of the spare unit jammed before the electrical connection was secured.[303] The loss of MBSU-1 limited the station to 75% of its normal power capacity, requiring minor limitations in normal operations until the problem could be addressed.
On 5 September 2012, in a second six-hour EVA, astronauts Sunita Williams and Akihiko Hoshide successfully replaced MBSU-1 and restored the ISS to 100% power.[304]
On 24 December 2013, astronauts installed a new ammonia pump for the station's cooling system. The faulty cooling system had failed earlier in the month, halting many of the station's science experiments. Astronauts had to brave a "mini blizzard" of ammonia while installing the new pump. It was only the second Christmas Eve spacewalk in NASA history.[305]
Mission control centres
The components of the ISS are operated and monitored by their respective space agencies at
Orbit, debris and visibility
Altitude and orbital inclination
The ISS is currently maintained in a nearly circular orbit with a minimum mean altitude of 370 km (230 mi) and a maximum of 460 km (290 mi),
Atmospheric drag reduces the altitude by about 2 km a month on average. Orbital boosting can be performed by the station's two main engines on the Zvezda service module, or Russian or European spacecraft docked to Zvezda's aft port. The Automated Transfer Vehicle is constructed with the possibility of adding a second docking port to its aft end, allowing other craft to dock and boost the station. It takes approximately two orbits (three hours) for the boost to a higher altitude to be completed.[314] Maintaining ISS altitude uses about 7.5 tonnes of chemical fuel per annum[315] at an annual cost of about $210 million.[316]

The Russian Orbital Segment contains the Data Management System, which handles Guidance, Navigation and Control (ROS GNC) for the entire station.[317] Initially, Zarya, the first module of the station, controlled the station until a short time after the Russian service module Zvezda docked and was transferred control. Zvezda contains the ESA built DMS-R Data Management System.[318] Using two fault-tolerant computers (FTC), Zvezda computes the station's position and orbital trajectory using redundant Earth horizon sensors, Solar horizon sensors as well as Sun and star trackers. The FTCs each contain three identical processing units working in parallel and provide advanced fault-masking by majority voting.
Orientation
Zvezda uses gyroscopes (reaction wheels) and thrusters to turn itself. Gyroscopes do not require propellant; instead they use electricity to 'store' momentum in flywheels by turning in the opposite direction to the station's movement. The USOS has its own computer-controlled gyroscopes to handle its extra mass. When gyroscopes 'saturate', thrusters are used to cancel out the stored momentum. In February 2005, during Expedition 10, an incorrect command was sent to the station's computer, using about 14 kilograms of propellant before the fault was noticed and fixed. When attitude control computers in the ROS and USOS fail to communicate properly, this can result in a rare 'force fight' where the ROS GNC computer must ignore the USOS counterpart, which itself has no thrusters.[319][320][321]
Docked spacecraft can also be used to maintain station attitude, such as for troubleshooting or during the installation of the S3/S4 truss, which provides electrical power and data interfaces for the station's electronics.[322]
Orbital debris threats
The low altitudes at which the ISS orbits are also home to a variety of space debris,
Ballistic panels, also called micrometeorite shielding, are incorporated into the station to protect pressurised sections and critical systems. The type and thickness of these panels depend on their predicted exposure to damage. The station's shields and structure have different designs on the ROS and the USOS. On the USOS,
Space debris is tracked remotely from the ground, and the station crew can be notified.
The November 2021 evacuation was caused by a Russian anti-satellite weapon test.[338][339] NASA administrator Bill Nelson said it was unthinkable that Russia would endanger the lives of everyone on ISS, including their own cosmonauts.[340]
-
A 7-gram object (shown in centre) shot at 7 km/s (23,000 ft/s), the orbital velocity of the ISS, made this 15 cm (5.9 in) crater in a solid block of aluminium.
-
Radar-trackable objects, including debris, with distinct ring of geostationary satellites
-
Example of risk management: A NASA model showing areas at high risk from impact for the International Space Station
Visibility from Earth
The ISS is visible in the
Because of the size of its reflective surface area, the ISS is the brightest artificial object in the sky (excluding other
Tools are provided by a number of websites such as Heavens-Above (see Live viewing below) as well as smartphone applications that use orbital data and the observer's longitude and latitude to indicate when the ISS will be visible (weather permitting), where the station will appear to rise, the altitude above the horizon it will reach and the duration of the pass before the station disappears either by setting below the horizon or entering into Earth's shadow.[344][345][346][347]
In November 2012 NASA launched its "Spot the Station" service, which sends people text and email alerts when the station is due to fly above their town.[348] The station is visible from 95% of the inhabited land on Earth, but is not visible from extreme northern or southern latitudes.[309]
Under specific conditions, the ISS can be observed at night on five consecutive orbits. Those conditions are 1) a mid-latitude observer location, 2) near the time of the solstice with 3) the ISS passing in the direction of the pole from the observer near midnight local time. The three photos show the first, middle and last of the five passes on 5–6 June 2014.
-
Skytrack long duration exposure of the ISS
-
The ISS on its first pass of the night passing nearly overhead shortly after sunset in June 2014
-
The ISS passing north on its third pass of the night near local midnight in June 2014
-
The ISS passing west on its fifth pass of the night before sunrise in June 2014
Astrophotography

Using a telescope-mounted camera to photograph the station is a popular hobby for astronomers,[349] while using a mounted camera to photograph the Earth and stars is a popular hobby for crew.[350] The use of a telescope or binoculars allows viewing of the ISS during daylight hours.[351]

Environment, safety and crew health
Environment
Freefall environment
Gravity at the altitude of the ISS is approximately 90% as strong as at Earth's surface, but objects in orbit are in a continuous state of freefall, resulting in an apparent state of weightlessness.[354] This perceived weightlessness is disturbed by five effects:[355]
- Drag from the residual atmosphere.
- Vibration from the movements of mechanical systems and the crew.
- Actuation of the on-board attitude control moment gyroscopes.
- Thruster firings for attitude or orbital changes.
- Gravity-gradient effects, also known as tidal effects. Items at different locations within the ISS would, if not attached to the station, follow slightly different orbits. Being mechanically connected, these items experience small forces that keep the station moving as a rigid body.
Radiation
The ISS is partially protected from the space environment by Earth's magnetic field. From an average distance of about 70,000 km (43,000 mi) from the Earth's surface, depending on Solar activity, the magnetosphere begins to deflect solar wind around Earth and the space station. Solar flares are still a hazard to the crew, who may receive only a few minutes warning. In 2005, during the initial "proton storm" of an X-3 class solar flare, the crew of Expedition 10 took shelter in a more heavily shielded part of the ROS designed for this purpose.[356][357]
Subatomic charged particles, primarily
Radiation levels on the ISS are between 12 and 28.8 milli rads per day,[358] about five times greater than those experienced by airline passengers and crew, as Earth's electromagnetic field provides almost the same level of protection against solar and other types of radiation in low Earth orbit as in the stratosphere. For example, on a 12-hour flight, an airline passenger would experience 0.1 millisieverts of radiation, or a rate of 0.2 millisieverts per day; this is one fifth the rate experienced by an astronaut in LEO. Additionally, airline passengers experience this level of radiation for a few hours of flight, while the ISS crew are exposed for their whole stay on board the station.[359]
Microbiological environmental hazards
Hazardous molds that can foul air and water filters may develop aboard space stations. They can produce acids that degrade metal, glass, and rubber. They can also be harmful to the crew's health. Microbiological hazards have led to a development of the LOCAD-PTS (a portable test system) which identifies common bacteria and molds faster than standard methods of culturing, which may require a sample to be sent back to Earth.[360] Researchers in 2018 reported, after detecting the presence of five Enterobacter bugandensis bacterial strains on the ISS (none of which are pathogenic to humans), that microorganisms on the ISS should be carefully monitored to continue assuring a medically healthy environment for astronauts.[361][362]
Contamination on space stations can be prevented by reduced humidity, and by using paint that contains mold-killing chemicals, as well as the use of antiseptic solutions. All materials used in the ISS are tested for resistance against
In April 2019, NASA reported that a comprehensive study had been conducted into the microorganisms and fungi present on the ISS. The experiment was performed over a period of 14 months on three different flight missions, and involved taking samples from 8 predefined locations inside the station, then returning them to earth for analysis. In prior experiments, analysis was limited to culture-based methods, thus overlooking microbes which cannot be grown in culture. The present study used molecular-based methods in addition to culturing, resulting in a more complete catalog. The results may be useful in improving the health and safety conditions for astronauts, as well as better understanding other closed-in environments on Earth such as clean rooms used by the pharmaceutical and medical industries.[366][367]
Noise
Space flight is not inherently quiet, with noise levels exceeding acoustic standards as far back as the
When compared to terrestrial environments, the noise levels experienced by astronauts and cosmonauts on the ISS may seem insignificant and typically occur at levels that would not be of major concern to the Occupational Safety and Health Administration – rarely reaching 85 dBA. But crew members are exposed to these levels 24 hours a day, seven days a week, with current missions averaging six months in duration. These levels of noise also impose risks to crew health and performance in the form of sleep interference and communication, as well as reduced alarm audibility.
Over the 19 plus year history of the ISS, significant efforts have been put forth to limit and reduce noise levels on the ISS. During design and pre-flight activities, members of the Acoustic Subgroup have written acoustic limits and verification requirements, consulted to design and choose the quietest available payloads, and then conducted acoustic verification tests prior to launch.[370]: 5.7.3 During spaceflights, the Acoustics Subgroup has assessed each ISS module's in flight sound levels, produced by a large number of vehicle and science experiment noise sources, to assure compliance with strict acoustic standards. The acoustic environment on ISS changed when additional modules were added during its construction, and as additional spacecraft arrive at the ISS. The Acoustics Subgroup has responded to this dynamic operations schedule by successfully designing and employing acoustic covers, absorptive materials, noise barriers, and vibration isolators to reduce noise levels. Moreover, when pumps, fans, and ventilation systems age and show increased noise levels, this Acoustics Subgroup has guided ISS managers to replace the older, noisier instruments with quiet fan and pump technologies, significantly reducing ambient noise levels.
NASA has adopted most-conservative damage risk criteria (based on recommendations from the National Institute for Occupational Safety and Health and the World Health Organization), in order to protect all crew members. The MMOP Acoustics Subgroup has adjusted its approach to managing noise risks in this unique environment by applying, or modifying, terrestrial approaches for hearing loss prevention to set these conservative limits. One innovative approach has been NASA's Noise Exposure Estimation Tool (NEET), in which noise exposures are calculated in a task-based approach to determine the need for hearing protection devices (HPDs). Guidance for use of HPDs, either mandatory use or recommended, is then documented in the Noise Hazard Inventory, and posted for crew reference during their missions. The Acoustics Subgroup also tracks spacecraft noise exceedances, applies engineering controls, and recommends hearing protective devices to reduce crew noise exposures. Finally, hearing thresholds are monitored on-orbit, during missions.
There have been no persistent mission-related hearing threshold shifts among US Orbital Segment crewmembers (JAXA, CSA, ESA, NASA) during what is approaching 20 years of ISS mission operations, or nearly 175,000 work hours. In 2020, the MMOP Acoustics Subgroup received the
Fire and toxic gases
An onboard fire or a toxic gas leak are other potential hazards. Ammonia is used in the external radiators of the station and could potentially leak into the pressurised modules.[373]
Overall health effects
On 12 April 2019, NASA reported medical results from the
In November 2019, researchers reported that astronauts experienced serious blood flow and clot problems while on board the ISS, based on a six-month study of 11 healthy astronauts. The results may influence long-term spaceflight, including a mission to the planet Mars, according to the researchers.[376][377]
Stress
There is considerable evidence that psychosocial stressors are among the most important impediments to optimal crew morale and performance.[378] Cosmonaut Valery Ryumin wrote in his journal during a particularly difficult period on board the Salyut 6 space station: "All the conditions necessary for murder are met if you shut two men in a cabin measuring 18 feet by 20 [5.5 m × 6 m] and leave them together for two months."
NASA's interest in
A study of the longest spaceflight concluded that the first three weeks are a critical period where attention is adversely affected because of the demand to adjust to the extreme change of environment.[379] ISS crew flights typically last about five to six months.
The ISS working environment includes further stress caused by living and working in cramped conditions with people from very different cultures who speak a different language. First-generation space stations had crews who spoke a single language; second- and third-generation stations have crew from many cultures who speak many languages. Astronauts must speak English and Russian, and knowing additional languages is even better.[380]
Due to the lack of gravity, confusion often occurs. Even though there is no up and down in space, some crew members feel like they are oriented upside down. They may also have difficulty measuring distances. This can cause problems like getting lost inside the space station, pulling switches in the wrong direction or misjudging the speed of an approaching vehicle during docking.[381]
Medical

The physiological effects of long-term weightlessness include muscle atrophy, deterioration of the skeleton (osteopenia), fluid redistribution, a slowing of the cardiovascular system, decreased production of red blood cells, balance disorders, and a weakening of the immune system. Lesser symptoms include loss of body mass, and puffiness of the face.[48]
Sleep is regularly disturbed on the ISS because of mission demands, such as incoming or departing spacecraft. Sound levels in the station are unavoidably high. The atmosphere is unable to thermosiphon naturally, so fans are required at all times to process the air which would stagnate in the freefall (zero-G) environment.
To prevent some of the adverse effects on the body, the station is equipped with: two
Life aboard
Living quarters

The living and working space aboard the International Space Station (ISS) is larger than a six-bedroom house, equipped with seven private sleeping quarters, three bathrooms, two dining rooms, a gym, and a panoramic 360-degree-view bay window.[387]
The station provides dedicated crew quarters for long-term crew members. Two "sleep stations" are located in the Zvezda module, one in Nauka, and four in Harmony.[388][389][390][391] These soundproof, person-sized booths offer privacy, ventilation, and basic amenities such as a sleeping bag, a reading lamp, a desktop, a shelf, and storage for personal items.[383][384][392] The quarters in Zvezda include a small window but have less ventilation and soundproofing.
Visiting crew members use tethered sleeping bags attached to available wall space. While it is possible to sleep floating freely, this is generally avoided to prevent collisions with sensitive equipment.[393] Proper ventilation is critical, as astronauts risk oxygen deprivation if exhaled carbon dioxide accumulates in a bubble around their heads.[383]
The station’s lighting system is adjustable, allowing for dimming, switching off, and colour temperature changes to support crew activities and rest.[394][395]
Crew activities

The ISS operates on Coordinated Universal Time (UTC).[396] A typical day aboard the ISS begins at 06:00 with wake-up, post-sleep routines, and a morning inspection of the station. After breakfast, the crew holds a daily planning conference with Mission Control, starting work around 08:10. Morning tasks include scheduled exercise, scientific experiments, maintenance, or operational duties. Following a one-hour lunch break at 13:05, the crew resumes their afternoon schedule of work and exercise. Pre-sleep activities, including dinner and a crew conference, begin at 19:30, with the scheduled sleep period starting at 21:30.[397]
The crew works approximately 10 hours on weekdays and 5 hours on Saturdays, with the remaining time allocated for relaxation or catching up on tasks. Free time often involves enjoying personal hobbies, communicating with family, or gazing out at Earth through the station’s windows.[397] The crew can watch TV aboard the station.[398]
When the Space Shuttle was operating, the ISS crew aligned with the shuttle crew's Mission Elapsed Time, a flexible schedule based on the shuttle's launch.[399][400][401]
To simulate night conditions, the station’s windows are covered during designated sleep periods, as the ISS experiences 16 sunrises and sunsets daily due to its orbital speed.
Reflection and material culture
Reflection of individual and crew characteristics are found particularly in the decoration of the station and expressions in general, such as religion.[402] The latter has produced a certain material economy between the station and Russia in particular.[403]
The micro-society of the station, as well as wider society, and possibly the emergence of distinct station cultures,[404] is being studied by analyzing many aspects, from art to dust accumulation, as well as archaeologically how material of the ISS has been discarded.[405]
Food and personal hygiene


On the USOS, most of the food aboard is vacuum sealed in plastic bags; cans are rare because they are heavy and expensive to transport. Preserved food is not highly regarded by the crew and taste is reduced in microgravity,[383] so efforts are taken to make the food more palatable, including using more spices than in regular cooking. The crew looks forward to the arrival of any spacecraft from Earth as they bring fresh fruit and vegetables. Care is taken that foods do not create crumbs, and liquid condiments are preferred over solid to avoid contaminating station equipment. Each crew member has individual food packages and cooks them in the galley, which has two food warmers, a refrigerator (added in November 2008), and a water dispenser that provides heated and unheated water.[384] Drinks are provided as dehydrated powder that is mixed with water before consumption.[384][392] Drinks and soups are sipped from plastic bags with straws, while solid food is eaten with a knife and fork attached to a tray with magnets to prevent them from floating away. Any food that floats away, including crumbs, must be collected to prevent it from clogging the station's air filters and other equipment.[392]
Showers on space stations were introduced in the early 1970s on Skylab and Salyut 3.[406]: 139 By Salyut 6, in the early 1980s, the crew complained of the complexity of showering in space, which was a monthly activity.[407] The ISS does not feature a shower; instead, crewmembers wash using a water jet and wet wipes, with soap dispensed from a toothpaste tube-like container. Crews are also provided with rinseless shampoo and edible toothpaste to save water.[393][408]
There are two space toilets on the ISS, both of Russian design, located in Zvezda and Tranquility.[384] These Waste and Hygiene Compartments use a fan-driven suction system similar to the Space Shuttle Waste Collection System. Astronauts first fasten themselves to the toilet seat, which is equipped with spring-loaded restraining bars to ensure a good seal.[383] A lever operates a powerful fan and a suction hole slides open: the air stream carries the waste away. Solid waste is collected in individual bags which are stored in an aluminium container. Full containers are transferred to Progress spacecraft for disposal.[384][409] Liquid waste is evacuated by a hose connected to the front of the toilet, with anatomically correct "urine funnel adapters" attached to the tube so that men and women can use the same toilet. The diverted urine is collected and transferred to the Water Recovery System, where it is recycled into drinking water.[392] In 2021, the arrival of the Nauka module also brought a third toilet to the ISS.[410]
End of mission
Originally the ISS was planned to be a 15-year mission.[411]
Therefore, an end of mission had been worked on,
Russia has stated that it plans to pull out of the ISS program after 2025.[415] However, Russian modules will provide orbital station-keeping until 2028.[412]
The US planned in 2009 to deorbit the ISS in 2016.[413] But on 30 September 2015, Boeing's contract with NASA as prime contractor for the ISS was extended to 30 September 2020. Part of Boeing's services under the contract related to extending the station's primary structural hardware past 2020 to the end of 2028.[416] In July 2018, the Space Frontier Act of 2018 was intended to extend operations of the ISS to 2030. This bill was unanimously approved in the Senate, but failed to pass in the U.S. House.[417][418] In September 2018, the Leading Human Spaceflight Act was introduced with the intent to extend operations of the ISS to 2030, and was confirmed in December 2018.[419][420][421] Congress later passed similar provisions in its CHIPS and Science Act, signed into law by U.S. President Joe Biden on 9 August 2022.[422][423]
If until 2031 Commercial LEO Destinations providers are not sufficient to accommodate NASA's projects, NASA is suggesting to extend ISS operations beyond 2031.[424]
NASA's disposal plans

NASA considered originally several possible disposal options: natural orbital decay with random reentry (as with Skylab), boosting the station to a higher altitude (which would delay reentry), and a controlled de-orbit targeting a remote ocean area.[425]
NASA determined that random reentry carried an unacceptable risk of producing hazardous space debris that could hit people or property and re-boosting the station would be costly and could also create hazards.
Prior to 2010, plans had contemplated using a slightly modified Progress spacecraft to de-orbit the ISS. However, NASA concluded Progress would not be adequate for the job, and decided on a spacecraft specifically designed for the job.[426]
In January 2022, NASA announced a planned date of January 2031 to de-orbit the ISS using the "U.S. Deorbit Vehicle" and direct any remnants into a remote area of the South Pacific Ocean that has come to be known as the spacecraft cemetery.[427] NASA plans to launch the deorbit vehicle in 2030, docking at the Harmony forward port.[428] The deorbit vehicle will remain attached, dormant, for about a year as the station's orbit naturally decays to 220 km (140 mi). The spacecraft would then conduct one or more orientation burns to lower the perigee to 150 km (93 mi), followed by a final deorbiting burn.[429][430]
NASA began planning for the deorbit vehicle after becoming wary of Russia pulling out of the ISS abruptly, leaving the other partners with few good options for a controlled reentry.[431] In June 2024, NASA selected SpaceX to develop the U.S. Deorbit Vehicle, a contract potentially worth $843 million. The vehicle will consist of an existing Cargo Dragon spacecraft which will be paired with a significantly lengthened trunk module which will be equipped with 46 Draco thrusters (instead of the normal 16) and will carry 30,000 kg (66,000 lb) of propellant, nearly six times the normal load. NASA is still working to secure all the necessary funding to build, launch and operate the deorbit vehicle.[16][431]
On 20 February 2025, Elon Musk, CEO of SpaceX and Senior Advisor to President Trump, suggested in a tweet that the International Space Station be de-orbited "two years from now" as Musk believes the station has "served its purpose" and has "very little incremental utility". Despite this, no official decisions on moving up the de-orbiting date have been made yet by the president.[432][433]
Post mission proposals and plans
The follow-up to NASA's program/strategy is the Commercial LEO Destinations Program, meant to allow private industry to build and maintain their own stations, and NASA procuring access as a customer, starting in 2028.[434] Similarly, the ESA has been seeking new private space stations to provide orbital services, as well as retrieve materials, from the ISS.[435][436] Axiom Station is planned to begin as a single module temporarily hosted at the ISS in 2027.[196] Additionally, there have been suggestions in the commercial space industry that the ISS could be converted to commercial operations after it is retired by government entities,[437] including turning it into a space hotel.[413]
Russia previously has planned to use its orbital segment for the construction of its
Western space industry has suggested in 2022 using the ISS as a platform to develop orbital salvage capacities, by companies such as CisLunar Industries working on using space debris as fuel,[440] instead of plunging it into the ocean.[415]
NASA has stated that by July 2024 it has not seen any viable proposals for reuse of the ISS or parts of it.[424]
Cost
The ISS has been described as the most expensive single item ever constructed.[441] As of 2010, the total cost was US$150 billion. This includes NASA's budget of $58.7 billion ($89.73 billion in 2021 dollars) for the station from 1985 to 2015, Russia's $12 billion, Europe's $5 billion, Japan's $5 billion, Canada's $2 billion, and the cost of 36 shuttle flights to build the station, estimated at $1.4 billion each, or $50.4 billion in total. Assuming 20,000 man-days of use from 2000 to 2015 by two- to six-person crews, each man-day would cost $7.5 million, less than half the inflation-adjusted $19.6 million ($5.5 million before inflation) per man-day of Skylab.[442]
In culture
The ISS has become an international symbol of human capabilities, particularly human cooperation and science,
Film
Beside numerous documentaries such as the IMAX documentaries
In 2022, the movie The Challenge (Doctor's House Call) was filmed aboard the ISS, and was notable for being the first feature film in which both professional actors and director worked together in space.[455]
Literature
The 2023 novel by English writer Samantha Harvey, Orbital, is set in the space station. It won the 2024 Booker Prize[456][457]
Ceridwen Dovey's Only the Astronauts, a 2024 collection of short stories in which the narrator in each story is an inanimate object in space, includes the International Space Station.[458]
Video Games
The ISS is blown up during the Call of Duty: Modern Warfare 2 mission Second Sun. The character Captain Price launches an ICMB into the earth's atmosphere, the shockwave destroying the station.[459]
The ISS shows up in Far Cry New Dawn as an expedition site. The ISS fell to earth following nuclear bombs leading to an apocalyptic earth.[460]
See also
- A Beautiful Planet (2016) – IMAX documentary film showing scenes of Earth, as well as astronaut life aboard the ISS
- Center for the Advancement of Science in Space – operates the US National Laboratory on the ISS
- List of accidents and incidents involving the International Space Station
- List of commanders of the International Space Station
- List of human spaceflights to the International Space Station
- List of International Space Station expeditions
- List of International Space Station spacewalks
- List of visitors to the International Space Station
- List of space stations
- List of spacecraft deployed from the International Space Station
- Politics of outer space
- Science diplomacy
- Space Station 3D (2002) – Canadian documentary
- Tiangong space station – another permanently crewed station operating in Low Earth orbit
Notes
- ^ Pirs was connected to the nadir port of Zvezda now occupied by Nauka.
- ^ partially retracted
- ^ "Zarya" has several meanings: "daybreak" or "dawn" (in the morning) or "afterglow", "evening glow" or "sunset" (in the evening), but NASA and Roscosmos translate it as "sunrise."[106]
- Ubuntu,[259] Gregory Olsen and Richard Garriott.[260][261] Canadian astronaut Bob Thirsk said the term does not seem appropriate, referring to his crewmate, Guy Laliberté, founder of Cirque du Soleil.[262] Anousheh Ansari denied being a tourist[263] and took offence at the term.[264]
- Robert Cabana who refused to train Dennis Tito, a member of Musabayev's crew along with Yuri Baturin. Musabayev argued that Tito had trained 700 hours in the last year and was as qualified as any NASA astronaut, and refused to allow his crew to be trained on the USOS without Tito. Cabana would not allow training to begin, and the commander returned with his crew to their hotel.
- ^ Including the modified DC-1, M-MIM2 and M-UM module transports
- ^ Includes both crewed and uncrewed missions
- ^ a b c d The Prichal aft, forward, port and starboard ports still have their protective covers in place and have yet to be used since the module originally docked at the station.
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In the Space Station Processing Facility at NASA's Kennedy Space Center, an overhead crane moves the Kibo Japanese Experiment Module – Pressurized Module toward the payload canister (lower right). The canister will deliver the module, part of the payload for space shuttle Discovery's STS-124 mission, to Launch Pad 39A. On the mission, the STS-124 crew will transport the Kibo module as well as the Japanese Remote Manipulator System to the International Space Station to complete the Kibo laboratory. The launch of Discovery is targeted for May 31.
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Attributions
This article incorporates public domain material from websites or documents of the

Further reading
- Reference Guide to the International Space Station (PDF) (Utilization ed.). NASA. September 2015. NP-2015-05-022-JSC. Archived (PDF) from the original on 4 May 2021. Retrieved 11 January 2018.
- Reference Guide to the International Space Station (PDF) (Assembly Complete ed.). NASA. 2010. ISBN 978-0-16-086517-6. NP-2010-09-682-HQ. Archived(PDF) from the original on 3 May 2021. Retrieved 9 January 2018.
- O'Sullivan, John. European Missions to the International Space Station: 2013 to 2019 (Springer Nature, 2020).
- ISSN 0038-4941.
External links
- Official website
- ISS Location Archived 14 August 2021 at the Wayback Machine
Agency ISS websites
Canadian Space Agency Archived 4 April 2009 at the Wayback Machine
European Space Agency Archived 13 May 2020 at the Wayback Machine
Centre national d'études spatiales (National Centre for Space Studies) Archived 28 February 2020 at the Wayback Machine
German Aerospace Center. Archived 7 November 2020 at the Wayback Machine.
Italian Space Agency Archived 9 August 2020 at the Wayback Machine
Japan Aerospace Exploration Agency Archived 20 July 2011 at the Wayback Machine
S.P. Korolev Rocket and Space Corporation Energia. Archived 27 June 2017 at the Wayback Machine.
Russian Federal Space Agency. Archived 27 June 2021 at the Wayback Machine.
National Aeronautics and Space Administration Archived 7 September 2005 at the Wayback Machine
Research
- NASA: Daily ISS Reports Archived 3 March 2019 at the Wayback Machine
- NASA: Station Science Archived 16 August 2018 at the Wayback Machine
- ESA: Columbus
- RSC Energia: Science Research on ISS Russian Segment. Archived 11 January 2018 at the Wayback Machine.
Live viewing
- Live ISS webcam Archived 19 October 2013 at the Wayback Machine by NASA at uStream.tv
- Live HD ISS webcams Archived 29 December 2016 at the Wayback Machine by NASA HDEV at uStream.tv
- Sighting opportunities Archived 25 August 2021 at the Wayback Machine at NASA.gov
- Complete Orbital Position Archived 12 October 2022 at the Wayback Machine at KarhuKoti.com
- Real-time position Archived 27 August 2021 at the Wayback Machine at Heavens-above.com
- Real-time tracking and position Archived 17 August 2021 at the Wayback Machine at uphere.space
Multimedia
- Johnson Space Center image gallery Archived 16 August 2021 at the Wayback Machine at Flickr
- ISS tour with Sunita Williams Archived 14 August 2021 at the Wayback Machine by NASA (on YouTube)
- Journey to the ISS Archived 18 August 2021 at the Wayback Machine by ESA (on YouTube)
- The Future of Hope, Kibō module documentary Archived 18 August 2021 at the Wayback Machine by JAXA (on YouTube)
- Seán Doran's compiled videos of orbital photography from the ISS:
- Orbit – Remastered Archived 17 August 2021 at the Wayback Machine
- Orbit: Uncut Archived 18 August 2021 at the Wayback Machine
- The Four Seasons Archived 21 August 2021 at the Wayback Machine
- Nocturne – Earth at Night Archived 19 August 2021 at the Wayback Machine
- Earthbound Archived 18 August 2021 at the Wayback Machine
- The Pearl Archived 10 March 2022 at the Wayback Machine (see Flickr album Archived 15 August 2021 at the Wayback Machine for more)
- Amateur Radio ISS Contact with Harrogate Ladies College in 2002 Archived 17 October 2023 at the Wayback Machine