Opportunity hasn't made a peep since June 10, when dust in the Red
Planet's air got so thick that the solar-powered rover couldn't
recharge its batteries. Opportunity's handlers think the six-wheeled
robot has put itself into a sort of hibernation, and they still hope to
get a ping once the dust storm has petered out.
https://www.space.com/41521-mars-dust-storm-opportunity-rover-still-silent.html
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Eduardo
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