Wikipedia:Today's featured article/November 10, 2007
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Uranus. It was first observed in 1979 by the Voyager 1 spaceprobe and thoroughly investigated in the 1990s by the Galileo orbiter. It has also been observed by the Hubble Space Telescope and from the ground for the past 25 years. Ground-based observations of the rings require the largest available telescopes. The Jovian ring system is faint and consists mainly of dust. It comprises four main components: a thick inner torus of particles known as the 'halo ring'; a relatively bright, razor-thin 'main ring'; and two wide, thick and faint outer 'gossamer rings', named for the moons of whose material they are composed: Amalthea and Thebe. The main and halo rings consist of dust ejected by high-velocity impacts from the moons Metis, Adrastea and other unobserved parent bodies. High-resolution images obtained in February and March 2007 by the New Horizons spacecraft revealed a rich fine structure in the main ring. The age of the ring system is not known but it may have existed since the formation of Jupiter. (more...
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