Question

Hydrogen makes up______of the matter in the universe​

Answer 1

Explanation:

Together, helium and hydrogen make up 99.9 percent of known matter in the universe, according to Encyclopedia.com. Even so, there is still about 10 times more hydrogen than helium in the universe, Nyman said. Oxygen, the third most common element, is about 1,000 times less abundant than hydrogen, she added.

Answer 2

Hydrogen — with just one proton and one electron (it's the only element without a neutron) — is the simplest element in the universe, which explains why it's also the most abundant, Nyman said. ... Together, helium and hydrogen make up 99.9 percent of known matter in the universe, according to Encyclopedia.com.