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The "Dzhanibekov effect", seen in a rotating object where it will flip its axis by 180 degrees, is demonstrated in microgravity with our camera.

Don Pettit

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The Dzhanibekov Effect: Spin any object with three different moments of inertia in zero gravity. The object will spin stably for a few seconds, then suddenly flip 180° while continuing its rotation, then flip back a few seconds later. It does this indefinitely.

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NASA astronaut demonstrating the Dzhanibekov effect. An astronaut noticed this physical behavior of a handle, that turned out to be the proof of a theorem: the tennis racket theorem (also dubbed the Dzhanibekov effect) The Tennis Racket Theorem states that an object with three unique moments of inertia, rotation about the axis of intermediate moment of inertia is unstable, while rotation about the other two axis is stable. The effect is named after the Russian cosmonaut Vladimir Dzhanibekov who discovered this phenomenon while in space in 1985.

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