Multiple choice

Light year is a unit of measurement of

  1. speed of light

  2. stellar distances

  3. speed of rockets

  4. speed of aeroplanes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A light year is the distance light travels in one vacuum year (approximately 9.46 trillion km). It measures stellar and interstellar distances, NOT the speed of light (which is constant at about 300,000 km/s). It is not used for measuring speeds of rockets or airplanes.

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