The distance of a galaxy from the earth is 5.6*10^25m. Find the time taken by light to travel this distance
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Given: distance = 5.6×10 ^25 m
Speed = 3×10^ 8 ms ^−1
Time = ?
Time taken = speed /distancetravelled
=5.6 x 10^25 / 3 x 10^8
=1.867 x 10^17 s
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