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Josh-D. S. Davis

Xaminmo / Omnimax / Max Omni / Mad Scientist / Midnight Shadow / Radiation Master

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Josh 201604 KWP
Pluto's hue changed dramatically during a 2-year period beginning in 2000. The new hue is 20% redder than it used to be. Nasa's scientists believe these are seasonal changes, as the planet heads into a new phase of its 248-year-long seasonal cycle.

"These changes are most likely consequences of surface ice melting on the sunlit pole and then re-freezing on the other pole," Nasa's Space Telescope Science Institute said in a statement.

The overall color is probably a result of ultraviolet radiation from the distant Sun breaking up methane on Pluto's surface.