On Jan. 4, 2004, Spirit--the first of two NASA Mars Exploration Rovers--landed on the Red Planet for what was to be a 90-day mission -- now into its 7th year. March 22, 2010), Spirit has been silent, and the project's scientists continue to listen for Spirit with the Deep Space Network and Mars Odyssey orbiter. The project is also conducting a paging technique called "Sweep & Beep" to stimulate the rover. Spirit's sister spacecraft Opportunity continues to explore Mars, arriving in December 2010 at the 80-meter (262-foot) diameter Santa Maria crater on its roving journey to Endeavour crater to be reached in 2012.
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