The universe's missing matter may have finally been found. Astronomers think regular matter — that is, the stuff that isn't dark matter — makes up about 15% of the universe's total mass. However, for ...

Add Yahoo as a preferred source to see more of our stories on Google. For millions of years following the Big Bang, after the universe’s roiling soup of particles had cooled, the cosmos was a dark and ...

Astronomers tallying up all the normal matter—stars, galaxies and gas—in the universe today have come up embarrassingly short of the total matter produced in the Big Bang 13.6 billion years ago. In ...

Astrophotographer Miguel Claro captured a stunning view of the Lion Nebula in the Cepehus constellation, revealing colorful clouds of ionized hydrogen gas. When you purchase through links on our site, ...