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 ...

CAPE CANAVERAL, Fla. – Vast frozen plains exist next door to Pluto’s big, rugged mountains sculpted of ice, scientists said Friday, three days after humanity’s first-ever flyby of the dwarf planet.

There, nitrogen and methane have turned into ice, covering the entire planet. Yet in this icy landscape, scientists speculate that there may be a liquid ocean beneath the ice, and this ocean might ...

Pluto has long been one of the most debated celestial bodies in our solar system. Once classified as the ninth planet, it was ...

(Correction: An earlier version of this story misstated how far Pluto is from the sun. The correct number is 3.7 billion miles.) What was discovered in Flagstaff, Arizona, and killed off in Prague? If ...

Things have been a mess since Pluto's demotion. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. In 2006, the International Astronomical Union ...