http://www.newscientist.com/article/mg19426004.100-duff-software-patch-sealed-mars-probes-fate.html
The reason why the mars global surveyor lost contact in november has now been revealed. A command, which was meant to fix a problem with the antenna, was sent to the wrong memory address. This caused the the spacecraft to reorient itself, which then left a battery directly exposed to the sun. The battery overheated and did not finish charging, so when the other onboard battery ran out of power, the mgs was lost.
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