Pluto

Though Pluto is now famously frigid, it may have started off as a hot world that formed rapidly and violently, a new study finds.

Pluto's thin, blue-tinged air may not collapse when the dwarf planet is far from the sun.

Pluto's discovery wouldn't have been possible, astronomers have realized, without the calculations of a mathematician whom history has forgotten.

Pluto's heart-shaped feature, which NASA's New Horizons spacecraft discovered during its epic July 2015 flyby of Pluto, drives atmospheric circulation on the dwarf planet, a new study suggests.

NASA's New Horizons mission turned Pluto from a fuzzy blob into a detailed, geophysically complex world. But it's still a little fuzzy, as it turns out.

The long-standing debate over Pluto's planethood recently got a public boost from NASA Administrator Jim Bridenstine, who said the world should definitely be a planet.

NASA is thinking about going back to Pluto, this time to stay for a while.

Pluto lost its "official" planet status over a decade ago, but fans of the solar system's underdog are still rooting for it. And NASA Administrator Jim Bridenstine is one of them.

Buried oceans like the one sloshing beneath the icy surface of the Jupiter moon Europa may be far more common across the cosmos than scientists had imagined.