MER-A (Mars Exploration Rover - A), known as Spirit, is the first of the two rovers of NASA's Mars Exploration Rover Mission. It landed successfully on Mars on 04:35 Ground UTC on January 4, 2004, three weeks before its twin Opportunity (MER-B) landed on the other side of the planet. #Exploration #Mars #NASA #Opportunity #Robot #Rover #Space #Spirit
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