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Tuesday, 2 November 2010

Speed of Light

Faster than light!?

The speed of light in a vacuum is presently defined to be exactly 299,792,458 m/s (approximately 186,282 miles per second). The fixed value of the speed of light in SI units results from the fact that the metre is now defined in terms of the speed of light.

Different physicists have attempted to measure the speed of light throughout history.

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