NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Abrasion marks on a Martian rock. Coloured composite image of marks left by the Rock Abrasion Tool (RAT) on NASA's Mars Exploration Rover Spirit. The rover has drilled into this rock, named Route 66, in order to expose enough of it to be able to use its miniature thermal emission spectrometer. The spectrometer enables it to analyse the composition of rocks. Photographed in April 2004.
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