NASA / JPL / US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY NASA / JPL / US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY
Martian rock. Microscopic image of the surface of the Martian rock 'Adirondack', taken by the Mars Exploration Rover Spirit. This is the first microscopic image of a rock on another planet. It shows a smooth and pitted surface. 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 this area was once covered in water. This image measures 3cm across and was taken in January 2004.
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