Recombination Era

The time when matter and radiation first separated. The Universe became `transparent'; the cosmic microwave background was emitted. The 'decoupling' between matter and radiation happened because the Universe was cool enough already to allow protons to capture one electron and form a neutral atom of hydrogen: the electrons, charged particles that in
Found on http://www.diracdelta.co.uk/science/source/r/e/recombination%20era/source.h
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