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DescriptionMartian ring2.JPG
English: Photographed by MER-A
Appears to be a ring shaped object, hollow sphere, or "pipe"-like feature. In fact it is just a semi-circular impression made in the sand by one of the rover's instruments (to look at soil physics/chemistry). So a perfectly rational explanation.
Sol 65, Microscopic imager. Downloaded from NASA web site. Believed to be public domain.
Source
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Please edit this file's description and provide a source.
The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]
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