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Why does the spacecraft go into sleep mode if it doesn't hear from Earth? If there's nothing left on the planet besides cockroaches and radioactive ash then chances are good that it will never be contacted again ever. I suppose this could come in handy if the main radio dish gets taken out by some space rubble and the science instruments can be spared while waiting for a replacement to arrive. (Or the spacecraft gets disoriented and attempts are made to reestablish contact, boring, blah blah).
Biting the hand that feeds IT
