The cosmic dark ages: Everything you need to know

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During the cosmic dark ages, the early universe was shrouded in darkness. Learn more about why this was the case and how the universe eventually became transparent.

The cosmic dark ages: Everything you need to know : Read more

 

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Space.com reported, "While it is generally accepted that the cosmic dark ages began 380,000 years after the Big Bang when the first neutral hydrogen atoms formed, exactly when this period ended is still a matter of debate."

Cosmology calculators can show the z number or range here if used.

Example, https://lambda.gsfc.nasa.gov/toolbox/calculators.html

This calculator suggest z ~ 1100 or so when the Universe is only about 370-380,000 years old. At redshift about 6, Universe age close to 1 Gyr. Seems there is a large redshift range where Population III stars and hydrogen gas filling the early Universe with no metals should be visible today. So far, nothing confirmed here it appears.