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... what is the difference between "hibernate" and "off"?
Thanks. That answers my question. However NASA was talking about putting the Mars Rovers into hibernation mode rather than letting the batteries run down until the rovers shut down. I got the impression that if this happened they would be unable to restart.I know NASA, and I suspect ESA designs their space probe without an "off switch" They can not be shut down from the ground at all. Why would the probe not turn itself back one once it got enough energy in it's batteries?