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From Wiki : Spirit, MER-A (Mars Exploration Rover -- A), is a robotic rover on Mars, active from 2004 to 2010. It was one of two rovers of NASAs ongoing Mars Exploration Rover Mission. It landed successfully on Mars at O4:35 Ground UTC on January 4, 2004, three weeks before its twin, Opportunity (MER-B), landed on the other side of the planet. Its name was chosen througha NASA-sponsored student essay competition. The rover became stuck in late 2009, and its last communication with Earth was sent on March 22, 2010. The rover completed its planned 90-sol mission. Aided by cleaning events that resulted in higher pow from its solar panels, Spirit went on to function effectively over twenty times longer than NASA planners expected following mission completion. Spirit also logged 7.73 km (4.8 mi) of driving instead of the planned 600 m (0.4 mi), allowing more extensive geological analysis of Martian rocks and planetary surface features. Initial scientific results from the first phase of the mission (the 90-sol prim