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speed of light
(redirected from The speed of light in a vacuum)

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Noun1.speed of light - the speed at which light travels in a vacuumspeed of light - the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second
light speed, c
constant - a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant"
speed, velocity - distance travelled per unit time
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E stands for energy, the M is mass and the C is the speed of light in a vacuum, what it takes to convert mass into pure energy.
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