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How much does a rainbow weigh?

 — Not much. It’s pretty light.

@erkhyan Actually, how much *does* a rainbow weigh? Gonna take that joke and go pedantic instead, as one does.

It's not the weight of the droplets, since there's no rainbow without the added near-parallel light source. It's just the optical properties.

A rainbow redirects some light upwards, exerting force downwards on the supporting air. So it's a bit like asking how much a reflection weighs.

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