Chemistry

Which of the following statements is true about a light-year? A) It is the distance to Alpha Centauri. B) It is shorter

Which of the following statements is true about a light-year?
A) It is the distance to Alpha Centauri.
B) It is shorter than the astronomical unit.
C) It is used to measure long periods of time.
D) It is used to measure long distances in space.

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