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

Have astronomers observed the first exomoon, or have they spotted a weird object that could challenge the very concept of ...

The curious minds at What If explore what would happen if Venus and Mars swapped orbits.

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

Since the first planet beyond our solar system was confirmed in the 1990s, astronomers have gone on to catalogue more than ...

Newly discovered object is so strange that we don’t know what to call it, astronomers say - Object might be the first moon ever spotted outside of our solar system ...

By Will Dunham WASHINGTON, July 22 (Reuters) - Scientists are documenting a planetary system in the Milky Way galaxy that is so starkly dissimilar to our own solar system that they are struggling to ...

The object about 72 light-years away from Earth could be the first satellite discovered outside our solar system.

Astronomers directly imaged a Jupiter-mass object orbiting a brown dwarf 72 light-years away, making it the strongest candidate yet for the first known exomoon.

Astronomers discovered a moon-like object orbiting a brown dwarf that's orbiting a star. Say that three times fast.