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Last updated on April 18, 2014 at 9:44 EDT
USSR Luna 21 Lander
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U.S.S.R. Luna 21 Lander

November 28, 2012
The rover tracks show variations in surface properties - in some locations the tracks are shallow where the regolith was hard; in other places the tracks are deep and considerable material disturbed where the regolith was soft. Lunokhod 2 rover tracks. Credit: Roskosmos & Russian Academy of Sciences, via V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry