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What is the most common element in the universe?
Confirmed
Hydrogen
Hydrogen makes up roughly three quarters of ordinary matter by mass, with helium most of the rest.
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?