How can you show that 1 light year is equal to 9.46*10 12km?
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1 light year is the distance travelled by light in 1 year
Speed of light =3*10^5 kmps
time in one year in seconds=1yr=365days=365*24 hours=365*24*3600 seconds
distance=speed*time=3*10^5*365*24*3600km=9.46*10^12km
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