# Could a people do all sort of gymnastics movement in vacuum space? [closed]

Could a people do all sort of gymnastics movement in vacuum space? I asked this because I am worry about that the astronaut leave the space shuttle during emergency could not go back to earth by himself if there are no fuel on the astronaut, could he swim in space to get back on earth even if there are no water?

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## closed as not a real question by Qmechanic♦, Sklivvz♦, Manishearth♦Dec 28 '12 at 12:42

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.

I don't understand your question. Could you try clarifying? –  Jonathan Gleason May 3 '12 at 22:10
Possible duplicates: physics.stackexchange.com/q/886/2451 and links therein. –  Qmechanic May 3 '12 at 22:16

@ColinK: It's true in practice and is how springboard divers power half-twists (by contortion of their arms). Longer twists musts take advantage of setting up unstable rotations around $I_2$. Think of it this way. You can't change your $L$, but you can rotate one part of your body relative another part until you run out of range of motion, so the final result is that you continue with the same $\omega$ but a different phase. Not sure how practical it is going to be in a vacuum suit, however. –  dmckee May 4 '12 at 1:40