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One light year is the distance that light travels in one year. The speed of light is 186,000 miles per second, or 300,000 km per second. There are 60 seconds in a minute, and 60 minutes in an hour. There are 24 hours in a day and a year is 365.25 days long. So, multiply 186,000 times 60 times 60 times 24 times 365.25.
by John Carl Villanueva on September 10, 2009. 1 light year is the distance light can travel in vacuum in one yearâs time. This distance is equivalent to roughly 9,461,000,000,000 km or 5,878,000,000,000 miles.This is such a large distance. For comparison, consider the circumference of the Earth when measured at the equator: 40,075 km.This visible-light image shows the galaxy dubbed UGC 3789, which is 160 million light-years from Earth.hat assignment is given to the parsec. 1 parsec is approximately equal to 3.26 light years. Another commonly used unit of distance is the astronomical unit or AU, wherein 1 AU is the average distance between the Earth and the Sun, and is roughly equivalent to 150,000,000 km.