It would because (1) there is gravity in space, (2) his balls and some person's fist are both inelastic, and (3) the impulse generated by the mass of his balls.
English
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They're referring to the zero gravity areas in space
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There's no such thing as zero gravity areas. The only way to escape gravity is through disconnecting with the rest of the universe in limbo. Even then, your own atoms gravitationally pull each other.