Light year is a unit of

Options :
  1. time
  2. mass
  3. distance
  4. energy
Answer and Explanation :-

Answer: Option 3

Explanation:

One light year is a distance which light travels in one year.

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There were times, in the beginning, when I used my journal as a wailing wall, but I learned not to immortalize the darkness. Rereading it was counterproductive. What I needed was a place in which to collect the light.
-Phyllis Theroux The Journal Keeper: A Memoir