Since midnight yesterday all communication with Opportunity has been lost. NASA team is not yet desperate to re-establish communications, but certainly the rover batteries have dropped in power to the point that it triggers an emergency procedure that turns off Opportunity (except the internal clock) and turns it back on at regular intervals to check the state of charge of the batteries.
If the battery charge drops to the point that it can no longer power the internal clock it will be the end of the mission.
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