'It's thought that in the early universe, this element made up 75% of all mass'
hydrogen
ELEMENT-ARY SCHOOL: Its thought that in the early universe, this element made up 75% of all mass
It's thought that in the early universe, this element made up 75% of all mass
It's thought that in the early universe, this element made up 75% of all mass
ELEMENT-ARY SCHOOL
hydrogen
ELEMENT-ARY SCHOOL