01-03-2004, 11:35 PM
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Join Date: Sep 2001
Location: 41.36N-81.32W
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Step Nine: Radar Ground Acquisition Begins
Around 20:34PST [04:34GMT], when the lander is about 8,000 feet above the surface, radar systems on the lander determine its altitude and vertical velocity relative to the martian surface. These measurements will help the landing system decide how long to fire the retro rockets to bring the lander's verticle speed close to zero
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