When was the first light in the universe?
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It takes 5 years for light to reach the earth from a star. Express the distance of star from the earth in (i) light year, (ii) km . Take speed of light =
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How far is a light-year? | Astronomy Essentials | EarthSky
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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 second - YouTube
Light travels at a constant 186,000 miles per second. Moving at the speed of light one could circum-navigate … | Space and astronomy, Andromeda galaxy, Astrophysics
What is a light-year?
