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About how old is the universe?
Confirmed
About 13.8 billion years
This figure comes from measurements of the cosmic microwave background and the universe's expansion.
What is the cosmic microwave background?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?