Multiple choice

A light year is a unit for

  1. time

  2. speed of light

  3. length

  4. year

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

3 The distance that light travels in a vacuum in one year, approximately 9.46 trillion (9.46 × 1012) kilometers or 5.88 trillion (5.88 × 1012) miles.