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Earth's gravity, the way we spin and air pressure are essential to have fun with the boomerang. Suppose we do same thing except in a vacuum chamber totally devoid of air will it still be able to "homing"?

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No. A boomerang is an airfoil, and generates a lift force as it travels. Without air, an airfoil is useless.

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    $\begingroup$ ...and hence fly ballistically, like a tennis ball. $\endgroup$ – pyramids Mar 24 '15 at 1:44

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