This patched-together image of Pluto shows New Horizons' views of the dark, cratered Cthulhu Regio below Sputnik Planum's bright, left lobe.

A large region of jumbled, broken terrain on the northwestern edge of Sputnik Planum (that's the big heart).

Scientists are still working out what causes these enigmatic fields of dark, aligned ridges. If they are dunes, that could mean Pluto has wind.

More detail of Pluto's big heart-shaped ice plain, Sputnik Planum.

Two different versions of an image of Pluto's haze layers, taken by New Horizons as it looked back at Pluto's dark side.

Pluto's bright, high-altitude atmospheric haze produces a twilight that softly illuminates the surface before sunrise and after sunset.

Charon's surface indicates a surprisingly complex geological history, including tectonic fracturing and mountainous uplift.