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Universe & Cosmos
10 verified entries, each with its sources and the date we checked it.
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?About how old is the light we see from the Andromeda galaxy?Which black hole was the first to be photographed, in 2019?Roughly how many galaxies are in the observable universe?What is the most common element in the universe?What did Edwin Hubble's 1929 measurements of distant galaxies' redshift show?