NASA has powered down the Mars Science Laboratory Curiosity as a precautionary measure due to a solar flare.
In 2003, a solar storm damaged a radiation instrument on the Mars orbiter Odyssey. NASA does not believe the radiation from this flare poses any danger to Curiosity but is being extra cautious due to recent computer problems with the $1.6 billion rover.
This shutdown illustrates the need for good space-weather forecasting for in-space operations, but space weather also affects the Earth. It will be important for future space travelers as well.
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