Question

multiple choice 1 pt mark the correct answer. 15. what does a lightyear measure? time speed mass distance

Explanation:

A light - year is defined as the distance that light travels in one year in a vacuum. Time is measured in units like seconds, minutes, years (but a light - year is not a time unit). Speed is measured in units like meters per second or kilometers per hour. Mass is measured in units like kilograms or grams. So a light - year measures distance.

Answer:

D. Distance (assuming the options are labeled as A. Time, B. Speed, C. Mass, D. Distance)