Light year is the unit of distance. It is the distance travelled by light in one year. If the speed of light is equal to 3x108 m/s , how many kilo-meters will make up 1 light year?

1 Light year = speed x time

                  = 3 x 108 m/s x 365 x 24 x 60 x 60 s

                  = 9.46 x 1015 m

                  = 9.46 x 1012 km

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