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The warming caused by sunlight hitting the surfaces of asteroids and meteoroids leads to a gentle recoil effect as the heat is released," he added. "By analogy, if one were to shine light on a propeller over a long enough period, it would start spinning."
Have you seen those little glass globes with the four "propellor blades" black on one side and white on the other..they spin with light on them. Dr A proposed how that effect worked but I cant remember exactly what he said.
alex
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