There’s a new frozen oddball orbiting the Sun, and it’s not your average space rock. It’s a planet—a minor one, to be ...

In the cold, distant reaches of the Solar System, far beyond Pluto, astronomers have just identified what could be a new ...

What did NASA’s New Horizons find when it reached Pluto? The results shocked astronomers: Pluto wasn’t a lifeless rock - it was geologically active, covered in glaciers, and had a hidden underground ...

On Pluto, however, these features primarily exist ... The larger of the two lobes, called Wenu, is itself a pile of 12 rocks huddled around a bigger slab, scientists announced on Tuesday.

A team from the University of Arizona has made a startling new discovery about the formation of Pluto and its moon. Published ...

as heard in the famous Schoolhouse Rock! song, Interplanet Janet. Upon the discovery of its existence in 1930, Pluto enjoyed decades of special status as one of the solar system's planets.

“If Charon deposited some of its rock into Pluto, you would be able to see that in gravity data,” said Dr. Denton. “Unfortunately we would need to go back to Pluto to test this.” ...

Instead, Pluto was reclassified as a “dwarf planet” because it has not “cleared its neighboring region of other objects” like asteroids and other space rocks over time like other planets ...

(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?

“Pluto and Charon are different — they’re smaller, colder and made primarily of rock and ice,” said Adeene Denton, lead study author of the research published Monday in the journal Nature ...