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FILE - This mosaic image taken by the navigation camera on the Mars Exploration Rover, "Spirit" on Jan. 3, 2004 shows an overhead view of the rover on the surface of Mars. NASA's Mars rover Spirit will rove no more. The space agency said Tuesday Jan. 26, 2010 that scientists have given up trying to free Spirit, which has been trapped in soft sand since last April. Instead, the focus will turn to tilting it to the north so it can get enough sunlight on its solar panels to survive the upcoming Martian winter. (AP Photo/NASA, File)

FILE - This undated file image provided by NASA shows the surface of Mars as seen from the stuck Mars rover, Spirit. Spirit has always been the unluckier of NASA's twin Mars rovers. Soon after landing in 2004, its computer went haywire, transmitting gibberish or sporadic data to Earth. Engineers eventually nursed it back to health. As Spirit and Opportunity approach their sixth year of exploration, Spirit finds itself stuck in a Martian sand trap. The robot geologist has been in jams before, but this is by far the toughest challenge it has faced. (AP Photo/NASA, File)

MARS ROVER TRACKS

Mars Rover on planet leaves tracks

NASA composite photo released 12 November 2009 from the navigation camera on the Mars Exploration Rover Opportunity shows tracks left by backing out of a wind-formed ripple after the rover's wheels had started to dig too deeply into the dust and sand of the ripple. The frames combined into this view were taken on the 1,867th Martian day, or sol, of Opportunity's mission on Mars (25 April 2009). The scene spans 120 degrees, from southeastward on the left to westward on the right. Two sols earlier, Opportunity drove 310 feet (100 meters) south-southwestward before stopping when the rover detected that its wheels were slipping more than the limit that engineers had set for the drive. That Sol 1865 (23 April 2009) drive created the tracks that enter this scene from the left and ended with wheels on the left side of the rover partially embedded in the ripple. On Sol 1867, the rover backed up 12 feet (4 meters) before taking this picture. Subsequently, Opportunity proceeded on a path avoiding the ripple where the wheel slippage occurred. For scale, the distance between the parallel wheel tracks is about about 40 inches(1 meter). This view is presented as a cylindrical projection with geometric seam correction. EPA/NASA/JPL/CALTECH HANDOUT FOR EDITORIAL USE ONLY

Mars Phoenix

FILE - This photo released Aug. 4, 2008 by NASA shows the Phoenix Mars Lander's solar panel and the lander's Robotic Arm with a sample in the scoop on Mars. Despite the odds, NASA on Monday, Jan. 18, 2010 will begin a three-day effort to listen for signs of life from the Phoenix lander, presumed frozen to death near Mars' north pole after spending five months digging into soil and ice. (AP Photo/NASA, File)

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