speed of light

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speed of lightsearch for term: The speed at which light travels, which is equal to 186,000 miles a second or 299,000 km/s. At this speed, light travels from the Earth to the Moon and back again in less than three seconds. According to Einstein's Theory of Special Relativity, the speed of light is always constant, regardless of the reference frame of the observer, and nothing in the universe can travel faster than the speed of light.