Determine the number of seconds in a year of 365 days.
[tex]\begin{gathered} 365\text{ days=365}\times24\times60\times60\text{ sec} \\ =31536000\text{ sec} \end{gathered}[/tex]Determine the light year in terms of kilometer.
[tex]\begin{gathered} 1\text{ light year=3}\times10^5\times31536000\text{ km} \\ =94608000\times10^5\text{ km} \\ =94608\times10^8\text{ km} \end{gathered}[/tex]So 1 light year is equal to 94608*10^8 km.
