If the speed of light is 3x10^8, determine the distance it takes in 1 light year. Report your results in km and in m.

The distance sun-earth is d=93⋅106 miles

d=149.6⋅106 km=149.6 x 109 m

The speed of light is c=3⋅108ms−1

The time is

t=d/c=149.6 x 109/ 3 x 108

=49.9⋅10=499s

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