Transcription: On August 21st 1993, the probe Mars Observer went dead and stopped sending back signals. Can you tell us why? Was there some sort of error in programming? No, no, no, no, that's not the reason. Actually we don't have an explanation, just a few hypotheses. NASA has four to be exact. The most likely is undoubtedly concerning a problem in the pressurization of the fuel tanks. You see, before the probe is put into orbit, the tanks have got to be pressurized. During this operation, the transmission circuits are deactivated to protect them. So then, what happened? Did the spacecraft explode? It's po ...
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