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…peed of light. You leave Earth, passing the moon, Mars, the asteroid belt, Jupiter, Saturn, Uranus, and Neptune. You’re going so fast — 299 million meters per second — but it still takes you five hours t…
When scientists talk about the speed of light — 299,792,458 m/s — we implicitly mean “the speed of light in a vacuum.” Only in the absence of particles, fields, or a medium to travel through can we achiev…