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Originally posted by johnsky
Ah, I see the miscommunication here...
He threw it INSIDE the international space station, he did not throw it in a vacuum.
Obviously, the international space station contains air, a mixture of oxygen and nitrogen (and any CO groups your body exhales).
The principles of the flight of a boomerang relies mainly on it's interaction with the gasses it moves through. (See : Aerodynamics).
The only effect gravity has on the boomerang is it limits it's vertical ascension somewhat, and during the last leg of it's flight, it's descent becomes noticeable. On the space station it would only be the lack of a downward force that is any different.
Without gravity, the boomerang (The astronaut used a 3 winged boomerang), would fly from the astronaut, and follow an elliptical flight path. The orientation of it's flight would depend on its physical orientation once thrown, and would indeed resemble a surprisingly similar flight path to one thrown from the earths surface. (Surprising if you didn't think about the forces at play before you threw it.)