One Pluto year equals 248 Earth years. At 1473 miles in diameter—about half the width of the United States—Pluto is the ...

Pluto, humanity's favorite dwarf planet, is getting some high-profile allies. "Star Trek" actor William Shatner wants to use ...

Once the quirky underdog of our solar system, Pluto held planetary status until 2006, when it got a cosmic demotion that still stings space fans. Discovered in 1930, Pluto was the ninth planet for ...

This humorous exchange reignited discussions about Pluto's 2006 demotion by the IAU and the enduring public sentiment for its planetary status. Elon, will you make Pluto a planet again?

William Shatner called for an end to the International Astronomical Union’s ‘tyranny of the cosmos’ as he made a planetary plea to Donald Trump ...

The presence of another planet in the solar system could explain the odd movements of some of the bodies in the Kuiper Belt.

A ninth planet the size of Neptune may be hidden in the far reaches of the solar system, but the evidence has left some experts skeptical.