For years, astronomers have been searching for a mysterious ninth planet lurking in the dark outer reaches of our solar ...

JWST has confirmed Pluto’s bizarre atmospheric behavior and its ghostly interaction with Charon. These findings could reshape ...

How long does it take Pluto to orbit the sun? Learn more about how this planet makes one lap around our Solar System.

Solar System Planets. Astronomy articles on the eight planets, plus the two dwarf planets, Pluto and Eris. Great pictures of everything in the solar system. Updated daily.