Question

Light year is a unit of .

• A. time
• B. speed
• C. distance
• D. light intensity

Answer 1

The correct option is C distance

One light year is defined as the distance that light travels in one Earth year in space. So, it expresses length, and hence, is a unit of distance.
$1\text{light year (ly)}\approx 9.5\times {10}^{15}\text{m}$