Closing in on Pluto, probe gives us the best pictures yet of distant world

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Tomorrow's will be even better. And the day after that, and the day after that…

Here's Pluto and its moon, Charon.

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The traditional guess is that Pluto would be an icy blue-gray:

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The reddish color might be caused by the presence of iron in the atmosphere. Or maybe it got mad with us when we downgraded it to a dwarf planet and is still sore.