/u/ktool's posts in /r/askscience
Why does a spectrograph of the sun's light produce multiple copies of the visible spectrum linked together by magenta?
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Does the effect of Newton's shell theorem appear only in full with perfect symmetry, or is there a gradual onset of its effects with gradually increasing symmetry?
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Does the sun shine brighter when it "peeks around" an object at you than it does in the middle of the sky?
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A common subject in this forum is that gravity propagates out from the Sun at the speed of light, and that Earth wouldn't leave its orbit until 8 minutes after the Sun disappeared. Wouldn't gravity propagate from Earth as well? Do those waves meet in the middle, and if so, what happens there?
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