Question : A light year is a measure of
Option 1: speed
Option 2: velocity
Option 3: distance
Option 4: time
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Correct Answer: distance
Solution : The correct answer is distance .
A light year is the measure of distance in interstellar space. It is the amount of distance a light ray can travel in one year. Light is used to measure astronomical distances because the speed of light is constant in a vacuum and it always travels in a straight line. The speed of light is 3 x 10 8 m/s.
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