Pluto

More than a half dozen clouds may have been seen in Pluto's hazy atmosphere, researchers announced today (Oct. 18).

The tiny, faraway object that NASA's New Horizons spacecraft will fly by in 2019 is even redder than Pluto, new observations by the Hubble Space Telescope suggest.

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

Pluto's underworld has been revealed in a new image that shows the boundary between vast, gray, icy plains and red, rugged highlands, the latter of which are named for a god of the underworld.

A spectacular new image of Pluto captured by NASA's New Horizons probe shows rugged mountains, nitrogen-ice plains and, perhaps, a big cloud scudding through the dwarf planet's exotic skies.

A newly released photo mosaic and video show Pluto's towering water-ice mountains, nitrogen glaciers and other exotic features in unprecedented detail.