Japan's Contribution to Space Science: Boomerang Does Return When Thrown in Zero Gravity!

Does a boomerang return when thrown in zero-gravity? Japanese astronaut Takao Doi did the experiment aboard the International Space Station:

Before he flew on the U.S. shuttle Endeavour to the International Space Station on March 11, astronaut Takao Doi told the press he wanted to test the boomerang in space. The idea came to him by request from his friend Yashuhiro Togai, a world boomerang champion. Doi has completed the test as promised and claims the boomerang worked well at the International Space Station.

A spokeswoman for the Japan Aerospace Exploration Agency told the Japanese daily Mainichi Shimbun that astronaut Takao Doi threw a boomerang and watched it come back.

Takao Doi told his wife in a chat from space that he was very surprised when the boomerang came back. He said it flies the same way it does on Earth.

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Well it wouldn't work in the vacuum of space because there is not any air molecule resistance to work with.. I believe that is the reason why boomerangs work - I may be entirely wrong, and they may depend solely on centripetal force...
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It's not so much an air molecule that a boomerang needs, but any kind of friction. If you had a good enough arm, a boomerarng would work underwater, underground, or in the atmosphere of any gas giant.
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This is actually the third time a boomerang has been thrown in space. A boomerang was thrown in microgravity in an atmosphere aboard Spacelab (1992 by German astronaut Ulf Meerbold), aboard Mir (1997 by the French Astronaut Jean-François Clervoy) and now the International Space Station (2008 by Japanese astronaut Takao Doi). Info from boom saint Ted Bailey.
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