Since the 1990s, astronomers have found a handful of other dwarf planets in the belt, such as Eris and Sedna, along with ...

Astronomers have discovered a planetary system that appears to flip one of astronomy's most reliable rules on its head.

Astronomers see the universe in ways most of us never imagine. These 10 surprising facts reveal the hidden forces, phenomena, and wonders shaping the cosmos. Loni Anderson's cause of death revealed ...

Black holes are places where gravity is so powerful that nothing — not even light — can escape. Rather than being empty, black holes are chock full of matter that gets squeezed into a teensy space.