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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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The sun is eight light minutes from Earth, and Pluto is 12 light hours away.
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It is known that plants give off oxygen during day light hours (and gives off a smaller amount of Carbon Dioxide at night), but a lesser known fact is that ordinary household plants absorb toxins from the air such as mold, formaldehyde and benzene.
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This is for the reason that most animals are active in the earlier parts of the day and spend the whole light hours sleeping or resting.
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