In what month and year did NASA officially declare the Spirit mission complete after multiple failed contact attempts?
Answer
May 2010
The final period of the Spirit mission was defined by a struggle against the increasing severity of the Martian winter and accumulating dust on the solar arrays, which severely limited available power. After a final planned communication attempt on April 22, 2010 (Earth Day), the rover failed to respond to subsequent efforts. Consequently, NASA formally declared the mission complete on May 25, 2010. At that point, Spirit was effectively powered down, buried in sand, and unable to gather the necessary solar energy to reboot its systems and transmit data back to Earth.
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