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Answer:

1 light year= 9.5 trillion km

Explanation:

Light year is distance traveled by light in one year.

Distance =  speed x time = speed of light x 1 year

1 light year= 3 x 10⁸ x 365 x 24 x 60 x 60 = 9.5 x 10¹⁵m=9.5x 10¹²km

1 light year= 9.5 trillion km

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