Decoupling Epoch/Era
(a) The epoch at t 1013 s after the big bang (T 3000 K) when matter and radiation decoupled.
(b) The era some 3 × 105 years after the Big Bang when the cosmic blackbody radiation was last scattered by the matter.
Decoupling Epoch - The time about a million years after the expansion of the universe began when the universe became transparent and light could, for the first time, travel great distances before being absorbed or scattered.
 See also: Alpha particle, Absorption, Earth, Mars, Jupiter
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