Light travels at the rate of 1,86,000 miles (or 3,00,000 km) per second. The distance traversed by the light in one year is known as light year.
light year = 3,00,000 x 60 x 60 x 24 x 365.25 km.
So, one light year = 9.46 x 1012 km.
i.e. 9,460 billion kilometres or 5,880 billion miles.
Light Year
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