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About how much of the universe's total energy is the ordinary matter that makes up stars, planets and people?
Confirmed
About 5%
Planck satellite results put ordinary matter near 5%, dark matter near 27% and dark energy near 68%.
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?