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

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

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

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

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) ...

Half of the universe's hydrogen has been missing since the Big Bang 13.8 billion years ago, but scientists reckon they've ...

Dark matter is hypothesized to outweigh "ordinary matter" in the universe by a factor of five. That means all the stuff we ...

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

Despite decades of searching for this signal, astronomers have yet to find it. The problem is that our Earth is too noisy, making it nearly impossible to capture this whisper. The solution is to go to ...

Researchers say they discovered evidence that early Earth was home to more hydrogen than previously thought, calling into ...

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