What is the invisible ancient glow resulting from redshifted, highly stretched ancient light called?
Answer
Cosmic Microwave Background (CMB)
While the universe is filled with ancient energy streaming towards us across all wavelengths, the expansion of space shifts the light from the earliest epochs into the microwave region of the spectrum. This ancient, highly redshifted glow, which pervades all directions in space, is known as the Cosmic Microwave Background (CMB). If our eyes were sensitive to microwave frequencies, we would perceive this glow, though it would still be much less bright than the Sun due to significant dilution from expansion.
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