Pluto

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.

Get your Google Cardboards ready, because it's time to take a 3D trip to Pluto.