'This element makes up about 1 percent of the mass of Earth but about 75 percent of the mass of the universe'
hydrogen
COSMOLOGY: This element makes up about 1 percent of the mass of Earth but about 75 percent of the mass of the universe
This element makes up about 1 percent of the mass of Earth but about 75 percent of the mass of the universe
This element makes up about 1 percent of the mass of Earth but about 75 percent of the mass of the universe
COSMOLOGY
hydrogen
COSMOLOGY