1 light year distance is the:
Correct answer: C. Distance travelled by light in one year
- A. Distance travelled by earth in one year
- B. Distance travelled by a star in one year
- C. Distance travelled by light in one year
- D. Distance travelled by light in one galactic year
Explanation
A light-year is defined as the distance that light travels in one year in a vacuum. Since light travels at a constant speed of approximately 299,792 kilometers per second (in vacuum), the distance it travels in one year is about 9.461 trillion kilometres (or about 5.879 trillion miles).
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