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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

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Given, distance of the galaxy = `10^(25)m`
Speed of light =`3xx10^(8)m//s`
Hence, time taken by light to reach us from galaxy is,
`t=("Distance")/("Speed")=(10^(25))/(3xx10^(8))approx1/3xx10^(17)`
=`10/3xx10^(16)=3.33xx10^(16)s`
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