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Why Do We Put Candles on Birthday Cakes? The Tradition Is More Complicated Than the Greek Legend
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The Photon Sphere: Where Light Can Orbit a Black Hole — and You Could See the Back of Your Head

The Photon Sphere: Where Light Can Orbit a Black Hole — and You Could See the Back of Your Head

A black hole does something stranger than simply swallowing light. Before a photon crosses the point of no return, spacetime can bend its trajectory so violently that the light can travel ar...

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