The New Horizons spacecraft took this high-resolution, enhanced color photo of Pluto’s largest moon Charon just before closest approach on 14 July, 2015. This image was created by combining blue, red and infrared images taken by the spacecraft’s Ralph/Multispectral Visual Imaging Camera. It’s been processed to highlight the variation of surface properties across Charon. The reddish material in the north (top) polar region (informally known as Mordor Macula) is methane that has escaped from Pluto’s atmosphere and been captured by Charon. Charon is 1,214 km across, and this image resolves details as small as 2.9 km.
Image Credit: NASA