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In vacuum, the speed of light is -- 299,792,458 meters per second

-- 186,282.397 miles per second. If you were to travel at the speed of light, you could go around

the Earth's equator approximately 7.6 times in one second.

(Flying in a typical passenger jet, at a ground speed of 500 mph,

it would take 4 hours to cross the continental US.)

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11y ago

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