Saturn’s largest moon, Titan, might have formed after a collision with a lost moon, according to new research.

Just 25 light-years from Earth, astronomers have watched a planetary system tear itself apart in real time, catching the dusty aftermath of violent impacts that were once only theoretical. Instead of ...

Astronomers tracking a nearby star system thought they had spotted an exoplanet reflecting light from its star. Then it vanished. Even stranger, another bright object appeared nearby. After studying ...