A light-year is the distance that light can travel in one year.
1 light-year = 9,460,000,000,000 km.
(a) Express one light-year in scientific notation
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One light year is 5,865,696,000,000 miles. That is a long way! 5,865,696,000,000 = 5.865696 x 1012 , written in scientific notation. You are used to measuring distances in inches, feet, yards, kilometers, meters, centimeters, etc.
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