- Types:
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light year, light-year
the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers
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light hour
the distance light travels in a vacuum in one hour; approximately one billion kilometers
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light minute
the distance light travels in a vacuum in one minute; approximately 18 million kilometers
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light second
the distance light travels in a vacuum in one second; approximately 300,000 kilometers
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AU, Astronomical Unit
a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers)
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parsec, secpar
a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years
