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Part of the fractured surface of Echus Chasma on Mars, viewed on Christmas Day, 2011 by the THEMIS instrument on board the Mars Odyssey spacecraft, which has been sending imagery home from Mars orbit since February of 2002. (NASA/JPL/ASU) #
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What eight dusty years on Mars will do to a rover. This pair of self-portaits from NASA's Mars Exploration Rover Opportunity shows dust accumulation on the rover's solar panels as the mission approaches its fifth Martian winter. The dust reduces the rover's power supply, and the rover's mobility is limited until the winter is over or wind cleans the panels. The photo on the left side was taken in February of 2005, when Opportunity had only been on the planet for 322 Martian days (sols). The right side was taken in December of 2011, after some 2,800 sols. Total distance driven by Opportunity to date: 34.36 km (21.35 miles) (NASA/JPL) #
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In the foreground, the high-gain antenna aboard NASA's Rover Opportunity, as the robotic probe has positioned itself on the rim of Endeavour Crater with an approximate 15-degree northerly tilt for favorable solar energy production during the Martian winter. While positioned for the winter, Opportunity is conducting regular radio Doppler tracking measurements to support geo-dynamic investigations of the planet. (NASA/JPL) #
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显身卡
