Sedna, a distant dwarf planet three-quarters the size of Pluto, is inching toward the brightest star in our sky — and in 2076 ...

Pluto once held its place proudly as the ninth planet in our solar system,a distant, icy world on the edge of the cosmic frontier. But in 2006, everything changed. This in-depth explainer unpacks the ...

An area of Pluto that researchers think was formed from the eruption of ice volcanoes is unique on the dwarf planet and in the solar system, a new study suggests, hinting at surprisingly recent ...

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.

In July 2015, NASA’s New Horizons spacecraft gave humanity its only close-up of Pluto.The spacecraft found that the dwarf planet, far from being a featureless and frigid orb, was an ostentatious ...

Leading Science Museum Says Pluto Is Lump Of Ice. One of the nation's leading science museums has quietly shaken up the universe by suggesting that Pluto is not necessarily a planet at all, but ...

At this moment, Pluto is still classified as a dwarf planet. Despite ongoing debate and public support for its reinstatement, the International Astronomical Union has not changed its 2006 decision.

Images of Pluto captured by NASA’s New Horizons mission have revealed a region full of giant ice volcanoes on the dwarf planet. These volcanoes were recently active and may support the idea that ...

Prepare yourself—the Pluto debate has returned and people are not going to be able to shut up about it. They’re going to have a lot of opinions and they’re going to need to share them ...

Pluto’s icy shell is thought to have a depth of at least 185 miles, which gives the researchers confidence that they’re right. The presence of other types of ice, such as frozen nitrogen and ...