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The original was posted on /r/space by /u/FakeGamer2 on 2025-11-04 00:36:24+00:00.

As per the Wikipedia page for the CMB, when it was emitted a few hundred thousand years after the Big Bang it was 3000K or about 4940f. Now it is currently at 2k which is -456f.

Logicslly this makes me think there was a brief window where it went thru earth like temps. Since the CMB is universal, technically the entire universe would’ve been earth like temps for this period of how ever many thousands of years.

So what was it like during this time, It is possible to calculate how long this period lasted and when it was after the CMB was emitted?