The distance of a galaxy from the earth is 5.6 × 10 to the power 25 metres assuming the speed of light to be 3 × 10 to the power 8 metres s to the power minus 1 find the time taken by light to travel this distance
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we have a formula
Speed=distance/time
time=distance/speed
=5.6×10^25/3×10^8
t =1.86×10^17 sec
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