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Opportunity went into safe mode during the communications pause in April when the Sun was between Mars and the Earth.
Mission controllers for Opportunity, which landed on Mars in January 2004, first learned of the issue on Saturday (April 27). On that day, the rover got back in touch after a nearly three-week communication moratorium caused by an unfavorable planetary alignment called a Mars solar conjunction, in which Mars and Earth are on opposite sides of the sun. The Opportunity rover apparently put itself into standby on April 22 after sensing a problem during a routine camera check, mission managers said.
It sounds like this is a recoverable problem and the rover will be back in operation momentarily. Stay tuned.