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.

Explanation

Given, distance of galaxy `=10^(25)m`
Time taken by light to reach us from galaxy is
`t=("Distance of galaxy")/("Speed of light")`
`=(10^(25)m)/(3xx10^(8)m"/"s) approx 3.3xx10^(16)s`
The order of the time taken is `10^(15)s`.