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Question

How far is the Sun from the Earth?


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Solution

Light Years

  1. A light-year is a unit used to measure astronomical distance.
  2. One light-year is defined as the total distance traveled by light in one year.
  3. One light-year is equal to 9.461×1015m

Distance between sun and earth

Speed of light =300,000km/s

Time taken for light to reach earth from the sun =500s8.3min

Number of seconds in a year =31,557,600s

Therefore, distance in light-years =50031,557,600=1.6×10-5 light-years

Hence the distance between the Earth and the Sun is 1.6×10-5 light-years.


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