WHAT IS A LIGHT YEAR
IT IS THE MEASURE OF DISTANCE STARS & PLANETS ARE SO FAR THAT WE CANNOT MEASURE IN KM SO HUGE DISTANCE ARE MEASURED IN LIGHT YEARS . LIGHT TRAVELS 299792.458 KM IN A SECOND .SO LIGHT YEAR IS THE DISTANCE TRAVELED BY LIGHT IN ONE YEAR APPROXIMATELY 9460000000000 KM
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