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              186,282 mps                           186,282 mps



    Let's suppose that two beams of light are traveling toward each other,
    destined for a head-on collision. The speeds shown are given in miles
    per second, the speed of light. What is the collision velocity? Time's
    up. The collision velocity is 186,282 miles per second. This is what
    physicists mean when they say that the speed of light is the ultimate
    velocity. Nothing can go faster. You don't add anything to the speed of
    light, period. Even light itself can't do it.