Pluto

Nearly two years after its historic encounter with the dwarf planet Pluto, NASA's New Horizons spacecraft is getting ready for its next big adventure in the icy outskirts of the solar system.

A new simulation of how Pluto got its "heart" reveals that the dwarf planet most likely has a deep ocean beneath its surface.

Pluto may be sharing its atmosphere with its largest moon, Charon, creating the visually striking red spot at the satellite's north pole.

Another batch of photos from NASA's New Horizons probe, which flew past Pluto on July 14, 2015, reveals the majesty and mystery of this icy world.

Pluto's mysterious "snakeskin" terrain may be made of material that predates the solar system's birth, scientists with NASA's New Horizons mission say.

Pluto's the prettiest dwarf planet at the party in this new, brilliantly colored image recently released by NASA.

A new photo beamed home by NASA's New Horizons spacecraft, which performed history's first flyby of Pluto this past July, reveals that the dwarf planet's skies have an azure tinge.