Radiation Era
The era from about 10 sec to about 1012 sec after the Big Bang, when the temperature had dropped to 109K and the rate of electron-positron pair annihilation exceeded the rate of their production, ...
Radiation Era - The period of time, before about 1 million years after the expansion of the universe began, when radiation rather than matter was the dominant constituent of the universe ...
THE RADIATION ERA
The universe began with an explosion from an incredibly hot and dense state. Precisely what state, we cannot say. And why it exploded, we really don't know.
radiation era - (n.)
collective name for the first three epochs of the history of the Universe (chaos, hadron epoch, lepton epoch), lasting overall about 100 sec and dominated by radiation rather than matter.
radiation pressure - (n.) ...
The era following the radiation era. The matter era started when the temperature of the primeval fireball had dropped to 3000 K, at which time the recombination of hydrogen became possible. [H76]
Matter Fields ...
For about the next 500,000 years electromagnetic radiation was the most important thing in the universe and hence this time was known as the radiation era.
 See also: Big Bang, Hydrogen, Earth, Light, Energy
  
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