Cosmic microwave background 4K 360
3,765 views · Published 21 September 2015 · 1:02 · Indexed 29 September 2026
Channel: French Touch Records · 2015 · Education
The cosmic microwave background (CMB) is the thermal radiation left over from the time of recombination in Big Bang cosmology. In older literature, the CMB is also variously known as cosmic microwave background radiation (CMBR) or "relic radiation." The CMB is a cosmic background radiation that is fundamental to observational cosmology because it is the oldest light in the universe, dating to the epoch of recombination. With a traditional optical telescope, the space between stars and galaxies (the background) is completely dark.
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