![](http://www.alamy.com/thumbs/6/CA19A541-301E-4FCC-B6C6-AD43CDCFE6C0/KRDE51.jpg)
Troughs showing blue in Elysium Planitia
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Photo credit: © NASA Image Collection / Alamy / Afripics
License: Licensed
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Keywords: astronomy, copy, editorial, nasa, news, night, photograph, photography, rocket, sky, space, stock