Seasonal dark streaks called recurrent slope lineae on Mars. They appear in Martian spring & summer but fade in winter, only to reappear again the next summer. Credit: HiRISE, NASA, MRO, LPL(U.Arizona). via /r/spaceporn http://bit.ly/2BECdzq
via Tumblr http://bit.ly/2NdX3Ki
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