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About how old is the light we see from the Andromeda galaxy?
Confirmed
About 2.5 million years
Andromeda is about 2.5 million light-years away, so we see it as it looked when early humans were appearing.
About how much of the universe's total energy is the ordinary matter that makes up stars, planets and people?About how old is the universe?What is the cosmic microwave background?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?Which black hole was the first to be photographed, in 2019?