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Question

Tarun got to know that the next nearest star to us is Alpha Centauri and is at a distance of 4 light years from the Earth. What does it mean? 
  1. Light has to travel 48 months to reach that star.

  2. Light has to travel 40 years to reach that star.

  3. Light has to travel 43 months to reach that star.

  4. Light has to travel 4 months to reach that star.


Solution

The correct option is A

Light has to travel 48 months to reach that star.


Light year is the distance light travels in one ‘Earth year’ which has 12 months in it. It is given that Alpha Centauri is 4 light years away from us. It means light has to travel 4 years or 48 months to reach that star.

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