Tarun got to know from his elder brother that sun is the nearest star and is approximately 150 million kilometers away from the earth. He wanted to know which is the next nearest star and what is its distance from the earth. His tutor told him that the nearest star is proxima centauri and is at a distance of 4.3 light years from the earth. Tarun does not know what a light year is. Can you tell him?

One light year is the distance travelled by the light in one year.

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