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The distance light travels in one year in a vacuum.
The distance light travels in one year in a vacuum.
It is a measure of distance used in popular science for distances to great to 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 astronomers prefer to use the [[parsec]] (approximately 3.26 light years) instead of the light year.