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The distance of a galaxy is of the order...

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.

Text Solution

Verified by Experts

Given, distance of the galaxy =`10^(25)m`
Speed of light `=3xx10^(8)m//s`
Thus, the time taken by light to reach us from galaxy is
`t=("Distance")/("Speed")=(10^(25))/(3xx10^(8))=(1)/(3)xx10^(17)`
`=(10)/(3)xx10^(16)=3.33xx10^(16)s`
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