Cosmic background radiation
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Cosmic background radiation is
The
There is also background radiation in the infrared, x-rays, etc., with different causes, and they can sometimes be resolved into an individual source. See cosmic infrared background and X-ray background. See also cosmic neutrino background and extragalactic background light.
Timeline of significant events
1896: Charles Édouard Guillaume estimates the "radiation of the stars" to be 5.6 K.[2]
1926: Sir Arthur Eddington estimates the non-thermal radiation of starlight in the galaxy has an effective temperature of 3.2 K. [1]
1930s: Erich Regener calculates that the non-thermal spectrum of cosmic rays in the galaxy has an effective temperature of 2.8 K.[2]
1931: The term microwave first appears in print: "When trials with wavelengths as low as 18 cm were made known, there was undisguised surprise that the problem of the micro-wave had been solved so soon." Telegraph & Telephone Journal XVII. 179/1"
1938: Walther Nernst re-estimates the cosmic ray temperature as 0.75 K.[2]
1946: The term "
1946:
1946: Robert Dicke predicts a microwave background radiation temperature of "less than 20 K" but later revised to 45 K (ref: Stephen G. Brush).
1946: George Gamow estimates a temperature of 50 K.[2]
1948: Ralph Alpher and Robert Herman re-estimate Gamow's estimate at 5 K.[2]
1949: Ralph Alpher and Robert Herman re-re-estimate Gamow's estimate at 28 K.
1960s: Robert Dicke re-estimates a MBR (microwave background radiation) temperature of 40 K (ref: Helge Kragh).
1965:
See also
References
- ^ "First minutes of the Big Bang". What is USA News. 12 March 2014. Archived from the original on 12 March 2014. Retrieved 2013-11-19.
- ^ a b c d e f Assis, A. K. T.; Neves, M. C. D. (3 July 1995). "History of the 2.7 K Temperature Prior to Penzias and Wilson" (PDF). Apeiron. 2 (3).