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In 1985 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). Here's ESA astronaut Sophie Adenot showing how it works.

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In 1985 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)

In 1985 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)

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In 1985 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). [📹 science.bill]

In 1985 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). [📹 science.bill]

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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.

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 "Tennis Racket Theorem" was substantiated when an astronaut observed a particular physical behavior of a handle in 1985.

The "Tennis Racket Theorem" was substantiated when an astronaut observed a particular physical behavior of a handle in 1985.

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The unusual behavior of a handle spinning in space, suddenly reversing its orientation, a striking example of the tennis racket theorem (also called the Dzhanibekov effect). 📽: NASA

The unusual behavior of a handle spinning in space, suddenly reversing its orientation, a striking example of the tennis racket theorem (also called the Dzhanibekov effect). 📽: NASA

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NOW - NASA astronaut Anil Menon and ESA astronaut Sophie Adenot are now nearly 3 hours into a 6.5 hour spacewalk outside the International Space Station to replace a Space-to-Ground antenna. Adenot is the first French woman to conduct a spacewalk — NASA

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NASA astronaut Anil Menon and European Space Agency astronaut Sophie Adenot embarked on a spacewalk outside the International Space Station. The operation, which lasted 6 hours and 30 minutes, included the replacement of a Space-to-Ground antenna that "enables high‑speed data transmission between NASA’s Mission Control Center in Houston” and the space station, NASA said.

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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. 🤔

🔩 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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After a first spacewalk earlier this week, ESA astronaut Sophie Adenot is preparing to head back outside the International Space Station on 25 August to install a replacement communications antenna. Coverage starts at BST / CEST Watch live 👉 More info 👉

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Wherever you are on planet Earth, Adenot Sophie has a message for you: "This solar eclipse is a beautiful reminder of the clockwork of our Solar System. Enjoy it. Stay curious." Our European Space Agency astronaut is watching the eclipse from the Cupola windows on the International International Space Station 🫶

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