(interval when the universe's hydrogen atoms were neutral)
The dark age is the time between recombination
when ions and electrons formed hydrogen atoms,
(around 380,000 years after the Big Bang or a redshift of 1090)
and the epoch of reionization when hydrogen atoms once again
split in large numbers, 150 million years after the Big Bang
or some time between redshift 6 and 20.
During this time, atoms were neutral and space was
transparent but there were no stars yet, thus all was dark.
(Big Bang,cosmology,hydrogen,ionization,early universe,recombination,EOR)
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epoch of reionization (EOR)