the cmb radiation was emitted by gas that was about 3000 k. why does it now represent a 2.74 blackbody?

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the cmb radiation was emitted by gas that was about 3000 k. why does it now represent a 2.74 blackbody?

the cosmic microwave background radiation was emitted by gas that was about 3000 k (about half the temerature of the sun). why does it now represent a 2.74 blackbody?

2007-12-12 04:23:59 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space

2 answers

Red shift due to the Hubble expansion. The CMBR was predicted by the Big Bang theory; it's the radiation emitted at the point when the early universe became transparent.

2007-12-12 04:39:38 · answer #1 · answered by injanier 7 · 0⤊ 0⤋

It cooled off over the eons.

2007-12-12 12:40:37 · answer #2 · answered by Anonymous · 0⤊ 0⤋