The Speed of Light
Everything Everywhere Daily
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The Speed of Light in Space Flights
The speed of light is an absolute universal constant. In 1975, the 15th General Council on Weights and Measures defined the distance light traveled in one second to be exactly 299,792,458 meters. The time it takes to send a radio signal to Mars can vary depending on where the planets are in their orbits. It can be as short as 3.1 minutes or as long as 22.2 minutes.
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