Comet 67P Repeatedly Changed Color During the Historic Rosetta Mission

A review of data taken over the course of the two-year Rosetta mission shows that comet 67P/Churyumov-Gerasimenko was sometimes reddish in appearance, while at other times it assumed a bluish hue. Sounds weird, but scientists have come up with a sensible explanation that doesn’t involve aliens with paint guns.
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