The European Space Agency’s (ESA) Envisat spacecraft remains stable in orbit after unexpectedly ceasing communication with ground stations April 8, according to optical, radar and laser observations of the spacecraft. With a recovery effort under way, ESA and its international partners are attempting to determine whether the Earth-observation satellite has entered “safe mode” — an indication that it could be revived. But efforts to reestablish contact with Envisat have so far been ...

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