Q. 54.5( 11 Votes )
Define the unit in w
The size of stars and the distance between them is enormous. To express such large distances, a unit called light year is commonly used. One light year is equal to the distance traveled by light in one year. Light travels 3 × 105 km in one second. A year has 365 × 24 × 60 × 60 = 3.1536 × 107 seconds. Thus, light will travel a distance of 3 × 105 × 3.1536 × 107 km in one year. This is equal to 9.46 × 1012 km. Thus one light year is equal to the distance of 9.46 × 1012 km.
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