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user-inactivated  ·  3439 days ago  ·  link  ·    ·  parent  ·  post: Pluto in Full color

We've know that Pluto is "red" and Charon is "grey" for a while now, at least since 2003 when Hubble took some images of Pluto. One of the science goals is to figure out why Pluto and Charon are different colors.