Mars Curiosity rover's three left wheels frame the lower slopes of Mount Sharp in this two-frame mosaic collected Sept. 9 by the Mars Hand Lens Imager (Mahli) during tests of the robotic arm. The six-wheel rover is set to drive as much as 40 km (25 mi.) a day, with a first stop at a good rock to reach out and sample with its Canadian-built alpha particle X-ray spectrometer (APXS). A version of similar instruments that flew on the Mars Pathfinder Sojourner rover and the two Mars ...


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