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What is the cosmic microwave background?
Confirmed
The faint afterglow of the early universe
It was released about 380,000 years after the Big Bang, when the universe cooled enough for light to travel freely.
About how old is the universe?What did Edwin Hubble's 1929 measurements of distant galaxies' redshift show?About how much of the universe's total energy is the ordinary matter that makes up stars, planets and people?What is expected to happen to the Milky Way and the Andromeda galaxy in about 4 to 5 billion years?Roughly how much would a teaspoon of neutron star material weigh?About how old is the light we see from the Andromeda galaxy?