Far beyond the bright planets, in the dim outskirts of the Solar System, astronomers keep stumbling on objects that refuse to follow the rules. Around Neptune in particular, a handful of newly charted ...

"In our solar system, the most massive moon is Ganymede, which is still extremely small compared to what we are inferring ...

Eight planets, hundreds of moons, hundreds of thousands of asteroids, and billions of comets orbiting our Sun make up our ...

Add Yahoo as a preferred source to see more of our stories on Google. Some exoplanets, like the one shown in this illustration, may have atmospheres that could make them potentially suitable for life.

A new discovery suggests the possibility of an exomoon with an unprecedentedly large mass, thousands of times larger than any ...

NASA’s newly launched IMAP mission is set to tell us more about the boundary between our Solar System and interstellar space ...

Astronomers are testing a quieter way of searching for moons beyond the solar system, using careful measurements of motion ...

Roll out the cosmic welcome mat for our solar system’s newest resident: a never-before-seen moon orbiting Uranus. A team of astronomers announced Tuesday that a new satellite measuring roughly 90 ...