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Hat sich da jemand einen Scherz mit dem Mars-Rover erlaubt oder ist diese Spur im Marssand durch Zufall entstanden? (Bild: NASA)

10 years on Mars: NASA rover mission anniversary

Ten years ago today, NASA dropped the first of two rovers onto the surface of Mars, kicking off a wildly successful mission that continues to beam home data about the Red Planet and its wetter, warmer past.

NASA's Spirit rover touched down on the night of Jan. 3, 2004 (Jan. 4 GMT), followed three weeks later by its twin, Opportunity. The two robots were originally supposed to explore Mars for 90 days, searching their disparate landing sites for signs of past water activity on the Red Planet. (Space.com)