Multiple choice

A light year is a measure of

  1. speed

  2. velocity

  3. distance

  4. time
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A light year is the distance that light travels in a vacuum in one Julian year. Despite having the word 'year' in its name, it is a unit of astronomical distance, not time. It is approximately 9.46 trillion kilometers.

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