NASA, JHUAPL, SWRI
A chain of enigmatic dark spots mark the surface of Pluto in recent New Horizons images, taken when the spacecraft was about 22 million kilometers from the dwarf planet. Each splotch is about 500 kilometers across and covers roughly the same area as the state of Missouri.
The pictures, taken on June 25 and 27, show two faces of Pluto and its largest moon, Charon, in true color; this is how the duo would appear to a human along for the ride. The original images, taken by the spacecraft’s zoom lens, are in black-and-white; the color comes from recent low-resolution images taken by the probe’s wide-field camera.
For more on the flyby, read SN's feature, "Rendezvous with Pluto."