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According to Live Science (This article and its images were originally posted on Live Science November 21, 2018 at 07:42AM.)
A camera aboard Mars Express captured this image of a lee cloud above Arsia Mons on Mars, on Oct. 10, 2018.A mysterious white-colored plume extending some 950 miles (just over 1,500 kilometers) has been spotted on the leeward side of the Arsia Mons volcano on Mars.
Unlike other Martian cloud structures that seem to poof in and out of existence, this one has staying power, with the lengthy plume hovering near Arsia Mons since Sept. 13 and seen as recently as Nov. 12, according to the European Space Agency. The agency’s Mars Express camera has been recording images of the mountainous cloud.
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