Why are light-years used to measure distances in space?
A. The speed of light is slower in space.
B. The speed of light is faster in time.
C. Distances in space constantly change.
D. Distances between stars are very large.
I think it's C. Check my answer somebody plz??
C is not right. B is not right. The correct answer is D.
Thanks!!
Actually, the correct answer is D. Distances between stars are very large. Light-years are used as a unit of measurement for distances in space because the vast distances involved are beyond the scope of more commonly used measurement units like kilometers or miles.
A light-year is defined as the distance light travels in one year in a vacuum, which is approximately 9.46 trillion kilometers or 5.88 trillion miles. Since light is the fastest thing we know of, using light-years allows us to better grasp the immense scale of the universe.
To answer this type of question, you can eliminate options A and B because they provide inaccurate information about the speed of light. Then, you can compare options C and D, but option D is the more logical choice as it directly addresses the reason for using light-years to measure distances in space.