What does light year mean ?
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Riess (STScI/JHU)) A light-year is a measurement of distance and not time (as the name might suggest). A light-year is the distance a beam of light travels in a single Earth year, or 6 trillion miles (9.7 trillion kilometers). On the scale of the universe, measuring distances in miles or kilometers doesn't cut it.
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the distance travelled by light in one year its a unit of astronomical measurement whereby light takes years to reach the surface of the earth
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