This image was taken by NASA’s Mars Reconnaissance Orbiter (MRO) Context Camera (CTX) on 2012-04-29T21:40:24.505.
NASA describes this image as “Mid-latitude valleys in Arabia Terra.”
Case #24: Semi-translucent disc on Mars:
I discovered what looks like a semi-translucent disc or saucer craft on the Martian surface.
It does not appear to look similar to any of the craters in the vicinity. I also cannot make out any major shadows on or around the craft, thus the term semi-translucent.
Original NASA source: http://viewer.mars.asu.edu/planetview/inst/ctx/G22_026994_2170_XI_37N335W
I used NASA’s image viewer to the left of the NASA web page to view this anomaly.
It seems to be sticking over a ridge line, is it perhaps air-borne?
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