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cybergarp  ·  3190 days ago  ·  link  ·    ·  parent  ·  post: Pluto in Full color

I found this article describing what they think the chemical composition is: http://www.universetoday.com/121158/red-faced-pluto-full-of-surprises/

To quote: "Pluto’s coloration is likely caused by hydrocarbon molecules called tholins that are formed when cosmic rays and solar ultraviolet light interact with methane in Pluto’s atmosphere."