A. the distance light travels in 1 yearB. a measurement of time within the universeC. a measurement of time within the solar systemD. the distance light travels in 1 second
A is correct (B and C are wrong because a light-year is a measurement of DISTANCE within the universe and solar system, not a measurement of time)
A with clarification. The distance light travels in one earth year
A light year is the total distance that light will travel in 1 earth year so your answer is indeed A
A of coarse! About 6 Billion miles.
1 light year = 9.4605284 × 1015 meters Defenition: A light year is a way of measuring distance. That doesn't make much sense because light year contains the word year, which is normally a unit of time. Even so, light years measure distance.
