The same group that demoted Pluto from planet to dwarf two years ago has decided to honor it by giving its name to potentially thousands of similar objects at the edge of our solar system. The ...

Pluto may have been demoted to non-planet status, but it still commands a court of five moons, as is fitting for the king of ...

A decade ago, poor Pluto got some unsettling news. It wasn't really a true planet, the International Astronomical Union said. Pluto was demoted to a more minor player in the solar system, a dwarf ...

Pluto just can't catch a break. It's official: Not only is Pluto now a "dwarf planet," the category to which it was relegated last year, but scientists have determined that it is not even the largest ...

Back in the 1980’s, a now-defunct magazine called Science Digest held a contest to name Planet X — the still-undiscovered world that astronomers believed might lie out beyond Pluto. One of the best ...