Free-floating, planetary-mass objects that are just drifting carefree through the galaxy, untethered and starless, appear to be able to generate their own systems of moons, like a planetary system on ...

The team of astronomers behind the find suggested it could help us better understand planet and moon formation in our solar system and beyond the Milky Way. The team was able to make the first-ever ...

What is the difference between a moon and a planet? Trick question! According to scientific definitions, there often isn’t much of a difference at all. That might seem counterintuitive, but it’s true.

Scientists have found strong evidence of a giant gas planet which could have habitable moons in the nearest star system to our own. The lifeless planet is thought to be four-and-a-half light years ...

Icy moons circling the outer planets may be far more dynamic—and explosive—than they appear. New research suggests that when ...

"In our solar system, the most massive moon is Ganymede, which is still extremely small compared to what we are inferring here." When you purchase through links on our site, we may earn an affiliate ...

This year, astronomers discovered more than 100 previously unknown moons in our own solar system. There may be many more yet to be discovered, and cataloguing them could help us better understand how ...

Astronomers have detected a massive, lonely world drifting through the darkness without a star to call home. This Saturn-sized rogue planet was discovered by an international team of scientists using ...

Moons may seem like quiet companions to the planets, but many of them are worlds every bit as fascinating as the planets themselves. Some are covered in oceans, some erupt with lava, and others hide ...