A distant 'exomoon' the size of Jupiter is changing how we think about the cosmos.

Astronomers have discovered a rare planetary system 71 light-years away, where a Jupiter-sized world orbits a brown dwarf, ...

Thomas Mulligan visualizes the staggering scale of the solar system by calculating exactly how many Earth-sized planets could ...

Barnard’s Star hosts four hostile small planets whose unusual chemistry and orbital rhythm reveal how compact planetary ...

By Will Dunham WASHINGTON, July 22 (Reuters) - Scientists are documenting a planetary system in the Milky Way galaxy that is ...

Astronomers say they are one step closer to finding a habitable, Earth-like planet beyond our solar system with the discovery ...

A brown dwarf is wobbling on its path around a star in a manner that indicates it has its own giant satellite. This ...

Scientists are documenting a planetary system in the Milky Way that is so starkly dissimilar to our own solar system they are ...

"These two planets have densities comparable to a nice blob of shaving foam fresh from the can." ...

Astronomers have identified a potentially habitable exoplanet just 25 light-years away, raising hopes that one of Earth's closest cosmic neighbours could eventually offer clues about life beyond our ...

Two giant planets lighter than cotton candy are giving astronomers a rare new window into the origins of some of the galaxy's ...