Semi-translucent disc on Mars

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.

Semi-translucent disc on Mars
Semi-translucent disc on Mars (click for larger image)
Semi-translucent disc on Mars (zoomed view)
Semi-translucent disc on Mars (zoomed view)
Semi-translucent disc on Mars (craters in the area)
Semi-translucent disc on Mars (craters in the area)

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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