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 ...

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 ...

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 ...

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 ...