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8 mysterious images of Mars

By: Katherine Butler on Oct. 11, 2010, 11:55 a.m.
robot arm and rocky wall

Photo: NASA/JPL/Cornell

8 of 9

Touching Mars

The arm in this photo belongs to the Spirit rover, which touched Mars in September 2005. Spirit was the first of two rovers sent to the red planet in 2004. It has been roaming the surface since then, though no communications have been received since March 2010. In May 2009, the rover became mired in some soft soil, where it remains.