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Astrophotographer Wayne Jaeschke reports on his website of a "strange feature" over the Martian plain called Acidalia that moves with the planet and seems to rise over the limb.
Whatever it is — or was — the feature is diminishing in size.
"This has led some to believe that it was some sort of transient-type event," Jaeschke told MSNBC.
The list of culprits includes a dust cloud from a meteorite impact, a massive storm system or just a trick of light