Oct 012015
Neato:
Pluto’s Big Moon Charon Reveals a Colorful and Violent History
An exaggerated-color photo of Plutos largest moon:
The brown spot it thought to be a polar cap composed of nitrogen and methane than have been acted upon by ultraviolet light. Presumably over a *long* time.
Here are Charon and Pluto to scale and as they would actually appear, roughly: