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The distance of a galaxy is of the order of 1025 m. Calculate the order of magnitude of time taken by light to reach us from the galaxy.

 

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It is given that the distance travelled by light from galaxy to earth = 10^{25}m.

We know that speed of light = 3\times10^{8}m/s

Thus, the required time = distance / speed

= \frac{10^{25}}{3}\times10^{-8}\; sec                                                                      

  = \frac{1}{3}\times 10^{17}sec

  = 3.3\bar{3}\times 10^{16}sec

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