Image:Martian ring1.JPG

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Photographed by MER-A detail

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 the Moessbauer spectrometer -- one of the rover's instruments (to look at soil physics/chemistry). So a perfectly rational explanation.

MER-A, Sol 65, Panoramic Camera.

from NASA website, believed to be public domain.

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