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.

 

Answers (1)

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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