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NASA / JPL / CORNELL / SCIENCE PHOTO LIBRARY NASA / JPL / CORNELL / SCIENCE PHOTO LIBRARY
Martian rock. 3-D perspective image of the Martian rock 'Adirondack' taken by the panoramic camera on the Mars Exploration Rover Spirit on 18th January 2004. The football-sized rock is the first target rock for geological research by Spirit. This rock was chosen by scientists because its clean, flat surface is ideally suited to grinding and close examination. Spirit will use a grinding arm to obtain samples of rock for chemical analysis by its spectrometers. The mineral composition of the rock may reveal how it was formed and whether the Gusev crater area, in which Spirit landed, was once covered in water.
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