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The effects on Earth if a black hole sped past at light speed

A small but incredibly fast unwanted guest is about to swing past Earth at the speed of light. Yeah, this is the tiniest ...
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What if a single needle hit earth at light speed

A single sewing needle is tiny enough to slip through fabric unnoticed, yet physics suggests that if it somehow struck Earth at light speed, the result would look less like a pinprick and more like a ...