1. The hues of #Mars' surface are generally thanks to dust cover—or (relative) lack thereof. Lighter areas = dusty, darker = less dusty. http://pic.twitter.com/EbsyOsVYVk
— Tanya Harrison (@tanyaofmars) July 14, 2017
via Twitter https://twitter.com/tanyaofmars
July 15, 2017 at 01:37AM
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