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1) a) A lightyear is the distance that light travels in a vacuum in one year at a speed of 3.0 x 10 5 km/s.

a) A lightyear is the distance that light travels in a vacuum in one year at a speed of 3.0 x 10⁵ km/s. Show the calculation for the number of meters in a lightyear. (Follow rules for Significant figures in result)

b) How many lightyears are there in 4.0 x 10¹⁶ m (the distance to the star nearest our sun)? (Follow rules for significant figures in result).

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