Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

Researchers have found a candidate for the hypothetical Planet Nine, which could be an undiscovered giant planet way out in ...

Scientists examined infrared space surveys to narrow down candidates for Planet 9. Planet 9 would be so far from the Sun that ...

The presence of another planet in the solar system could explain the odd movements of some of the bodies in the Kuiper Belt.

The dark nebula is part of the Circinus West molecular cloud, which stretches for 180 light-years, containing a mass 250,000 ...

Scientists have found evidence for a cosmic collision in the Perseus cluster, a group of thousands of galaxies not far from ...

The largest sample of galaxy groups ever detected has been presented by a team of international astronomers using data from ...

A rare and dramatic scene unfolds 140 light-years from Earth. A rocky planet, once whole, is now crumbling to dust under the ...

All but one of Andromeda's satellite galaxies were found to be pointing right at us. According to our best models, that shouldn't be the case at all.

"Most people just dismiss partial eclipses. But I wanted to go to this partial eclipse to try to get the corona — and I did ...

"The key planet-formation processes in protoplanetary disks remain an active matter of research. One promising mechanism to ...

The trio is a rarity—and when all of its unusual traits are considered together, it is unique.