Why do we measure the distance in light-years instead of miles A. Units of light-years sound better.

Why do we measure the distance in light-years instead of miles A. Units of light-years sound better. B. Using light-years reduced the number of figures used. C. We used to measure distance in light-years long ago. D. We do not make mistakes when we use light-years.

The correct answer is:

B. Using light-years reduced the number of figures used.

When measuring astronomical distances, using miles (or kilometers) would result in astronomically large numbers that are hard to comprehend. For example, the distance from Earth to the nearest star, Proxima Centauri, is about 25 trillion miles. Instead, a light-year, which is the distance that light travels in one year (about 5.88 trillion miles), provides a much more manageable and understandable number for these vast distances.