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[i]In the same way that FIDOs needed to know the precise weight of cargo and crew in Aquarius before burning the descent engine, so too did the guidance and navigation officers need to know how much ballast Odyssey carried before aligning the platform and aiming the ship for reentry. The computers in an Apollo spacecraft were programmed to expect a command module returning from the moon to weigh one hundred pounds more on its earthward journey than on its moonward journey — that hundred pounds representing the rocks and soil samples the crew went out there to get in the first place. But this Apollo was returning from the moon rockless, and before it could reenter the atmosphere, the astronauts would have to transfer a few armloads of equipment from the LEM up to the command module, pack them away in the storage areas that were to hold the priceless bits of the moon, and hope that the weight was right and the computer was fooled.[/i]
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