The Milky Way, our home galaxy, is part of a different supercluster called Laniakea, which, at 500 million light-years wide, ...

Astronomers have long struggled with a troubling puzzle: a significant portion of normal matter in the universe appeared to ...

The Hubble Space Telescope has captured imagery of spiral galaxy UGC 2890. The "galaxy lies around 30 million light-years ...

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

A slowly spinning universe could resolve a puzzle in physics known as the Hubble tension, a new model suggests.

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

A blob of gas seen outside the Milky Way could be a type of starless, dark matter–dominated galaxy. Some scientists are skeptical.

A new study published in the Monthly Notices of the Royal Astronomical Society suggests that the universe may be rotating — ...

Scientists found the universe's missing baryonic matter as invisible hydrogen outside galaxies using a method called 'stacking' ...

In the grand puzzle of the cosmos, one question continues to defy easy answers: how fast is the universe expanding?

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

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