When 1I/'Oumuamua was first spotted in 2017, astronomers quickly determined that it came from outside the solar system. But ...

Pluto, once thought to be a frozen and lifeless world drifting on the edge of our solar system, may be harboring one of its ...

Two of Pluto's midsize moons may be made of the guts of its largest moon, Charon, new research suggests. New observations ...

In Roman mythology, Pluto is the god and ruler of the dead. For a return mission to the dwarf planet, Howett and her ...

Simultaneously cooling Pluto while energizing atmospheric molecules to allow them to escape into space, Pluto's haze plays a key role in the planet's energy balance.

Pluto once had a subsurface ocean, and finding these ice volcanoes could suggest that the subsurface ocean is still present -- and that liquid water could be close to the surface.

Pluto’s surface has been reshaped by internal and atmospheric forces, while most of Charon’s surface hasn’t been reshaped for 4 billion years, according to the new reports.

Several mysterious dark spots on the surface of Pluto have caught the attention of NASA researchers as the New Horizons probe makes its final approach.

Researchers propose an ammonia-water slurry as the basis for Pluto's newly discovered geologic activity and possible volcanism, and offer a new method to predict planetary vigor.

NASA has released a ton of information about Pluto in the past few days. Here's a quick overview of the most essential points and pictures.