What is the Speed of Light? - Universe Today
How long is a light-year?
SOLVED:Astronomy One light-year is defined by astronomers to be the distance that a beam of light will travel in 1 year (365 days). If the speed of light is 186,000 miles per
Light Year Visible light travels at a speed of 186,000 miles/second, or to think of this speed in terms of time and distance, a light- second is 186, ppt download
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