'We haven't stopped exploring.' ...

Scientists may have discovered a new dwarf planet hiding on the edge of our Solar System, and it could be one of the largest ...

But what exactly is a planet? It seems like an easy question. After all, you’re standing on one right now! But the scientific definition was fairly loose until recently. The discovery of other ...

Astronomers have discovered a celestial body on the frozen outskirts of our solar system, potentially making it one of the largest dwarf planets ever identified The deep-space object, designated 2026 ...

Add Yahoo as a preferred source to see more of our stories on Google. Dottedhippo/Getty Images On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by ...