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scientists use the light year to describe the relationship between object in space. what does light year measure?
A) the distance that light can travel in one year
B) the time it takes light to travel 1 million km
C)the brightness of light that travel through space
D) the number of years it takes light to travel to earth

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Answer:

The answer is B

Explanation:

The definition of a light year is the unit of astronomical distance, though it is called a light year it is actually a measurement of distance, so the answer, "the  time it takes light to travel 1 million km is the correct answer.

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