Astronomers tallying up all the normal matter—stars, galaxies and gas—in the universe today have come up embarrassingly short ...

The halo is more extended that astronomers originally thought, and contains enough hydrogen gas to resolve the problem of the ...

Mysterious dark matter makes up 85 percent of matter in the universe, and of the remaining 15 percent, scientists couldn’t ...

About half of the non-dark matter in the universe cannot be accounted for by stars and galaxies alone. Now, scientists say ...

For decades, scientists have known that ordinary matter — everything made of atoms — accounts for just 15% of the universe’s ...

JADES-GS-z13-1-LA is a young galaxy shining just 330 million years after the Big Bang, signaling it's part of a process ...

For decades, scientists have been puzzled by the missing mass in the universe. While we know that about 85% of the universe is made up of dark matter, the remaining 15% is made up of normal (baryonic) ...

Scientists have located the missing half of the Universe's visible matter as vast clouds of ionized hydrogen in intergalactic ...

Learn how astronomers found the invisible ionized gas that forms puffy halos surrounding galaxies.

Our sun, like all stars, is made mostly of hydrogen and helium. They are by far the most abundant elements, formed in the ...

A new analysis of the sky has finally confirmed where the missing half of the Universe's visible matter has been hiding. In ...

Astronomers may have found the long-missing half of the universe's regular matter—and it appears to have been right under our ...