Question

THE universe is made up of

Answer 1

Scientists believes that the universe is made out of gas, hydrogen, and helium.
Some people think that the universe is made up of baryonic matter. Its the same kind of matter that makes up everything on earth and all the stars (protons, electrons and neutrons).

Hope this helped :)
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Answer 2

Well there are several things scientists Believe or Believed the universe is made out of, some of these include

1. "baryonic matter" (a.k.a. Ordinary Atoms)

2. Dark Matter, Normal matter, and dark energy (This seems like the most popular theory)

Obviously there is no exact answer but these are just a few theorys