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There are things that naturally face downwards, like hands. How would they be affected in space microgravity? Would they rise or point downwards?

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The "neutral body posture" in weightlessness tends to lift the arms and flex the knees slightly. Palms generally face downward. It varies person to person; here's a sample of 6 space shuttle astronauts from STS-57:

computer renderings of four men and two women with knees slightly bent arms drifting at various heights from hip level to shoulder level

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