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No viscosity means no friction between neighbouring particles. I think outer space is such a place. So a golfball or a tennis ball traveling in space with a large spinning such as backspin would not experience the Magnus effect where the ball changes its direction due to spinning.

Is this correct? So a ball in outer space would not experience Magnus effect due to a large spinning? So is playing tennis in outer space a very directional game without spins and curvatures?

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Yes, if you throw a ball in a vacuum its spin will not affect its trajectory. This isn't because there's a liquid with no viscosity, it's because there isn't anything at all!

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