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Home » The distance of a galaxy is of the order of m. Calculate the order of magnitude of time taken by light to reach us from the galaxy.
The distance of a galaxy is of the order of 10^{25} m. Calculate the order of magnitude of time taken by light to reach us from the galaxy.
CBSE | Class 11 | NCERT Exemplar | Physics | Units and Measurements
The distance of a galaxy is of the order of 10^{25} m. Calculate the order of magnitude of time taken by light to reach us from the galaxy.

The distance of the galaxy is given as 1025m

Speed of light is known as 3\times 10^{8}m/s

Time taken is

t = distance/speed =3.33\times 10^{16}s

i

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