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light hour
(redirected from Light-hour)

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Noun1.light hour - the distance light travels in a vacuum in one hour; approximately one billion kilometers
astronomy unit - a linear unit used for astronomical distances
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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22, more than four hours of light-hours have moved over to the dark side.
Measly summer gives way to fall by Telegram & Gazette (Worcester, MA)
 
 
 
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