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Line 1: − The distance light travels in one year in a vacuum.+ − +
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A light year is the distance light travels in one year in a vacuum.
It is a measure of distance used in popular science for distances to great too express in kilometers or miles.
It is a measure of distance used in popular science for distances to great too express in kilometers or miles.
Professional astronomers prefer to use the [[parsec]] (approximately 3.26 light years) instead of the light year.
Professional [[astronomer]]s prefer to use the [[parsec]] (approximately 3.26 light years) instead of the light year.
The light year is easily derived from the speed of light which is about 300,000,000 meters per second = <B><math>3x10^8</math></B>m/s.
The light year is easily derived from the speed of light which is about 300,000,000 meters per second = <B><math>3x10^8</math></B>m/s.