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As of Thursday, July 26, NASA rovers Spirit and Opportunity are both enduring levels of reduced power supply. The rovers can survive at these levels, but NASA continues to sharply restrict their activities. Spirit is under the dustiest sky ever seen at that location. Sunlight at Spirit's location is more obscured than current conditions for Opportunity, though not as severe as what Opportunity faced a week ago. Mission controllers Thursday received the first status report from Opportunity in...