This image of the rock called "Humphrey" was taken by Spirit's navigational camera. Standing about 2 feet tall, it is one of the largest blocks of what scientists believe is ejected material from one of the rover's long-term targets, the crater dubbed "Bonneville." Scientists are eager to investigate ejected rocks, as they give a glimpse of the composition of what lies beneath the Red Planet's surface.
(Photo: NASA/JPL)
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