Explicit expressions are derived for the temperature in the early, radiation dominated, universe in terms of time. The temperature in this era is inversely proportional to the square-root of time. Consequently, the temperature is singular at the Big Bang. The relationship between temperature and the size scale of the universe is also derived.
Limitations: For the temperature-time relation in the matter dominated era see Chapter 4.
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SN 1604 (Kepler's Supernova, Type 1a, constellation Ophiuchus). Last observed supernova in our galaxy. False colour key: Blue = X-ray (4-6 keV), Green = X-ray (0.3-1.4 keV), Yellow = Optical, Red = Infrared [Chandra X-Ray Observatory, NASA, plus Hubble (visible) and Spitzer (infrared)]