A) energy
B) speed
C) distance
D) intensity
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The correct answer is C) distance
You may have heard the term ‘light-year‘ used in astronomy. It is a unit of distance in which light travels in one Earth year.
A light-year is approximately 6 trillion miles (9.7 trillion km), which is 63,000 times the distance from the Earth to the Sun! This distance can be used to measure astronomical distances, as light is one of the fastest speeds we can measure.
It’s important to note that a light-year is measured in a vacuum, as air resistance or any other form of resistance would slow it down. Light-years are an incredible way to measure our vast universe and all its wonders!