Mathematicians calculated where the planet might be based on its effects on Uranus, and astronomers searched for less than an ...

The dwarf planet Pluto and its five known natural satellites (Charon, Styx, Nix, Kerberos, and Hydra) may be frigid, but ...

There’s something intriguing about the unknown, especially when it’s hurtling towards our solar system. Astronomers and ...