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When an object spins in zero gravity about its middle axis, the rotation is inherently unstable, and the object periodically flips 180 degrees mid-flight, a phenomenon known as the Dzhanibekov effect.

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🔩 An unexpected twist in space The Dzhanibekov effect: an object rotating in zero gravity suddenly flips its axis of rotation. This occurs due to differences in the moments of inertia across the three axes, causing rotational instability. Demonstrated by Vladimir Dzhanibekov in 1985, this phenomenon shows how even a simple nut behaves unpredictably in orbit. 🤔
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In the weightless quiet of orbit, an astronaut sets a simple T-handle spinning — and physics takes over. Rotating around its unstable intermediate axis, the object suddenly flips 180 degrees, again and again, in a mesmerizing demonstration of the Dzhanibekov effect that no amount of ground-based intuition can quite prepare you for.
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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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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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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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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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