Light-year
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What is a Light-Year?
A light-year is the distance light travels in an Earth year. Learn more about astronomy terms with our picture encyclopedia!
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Storyboard Description
A astronomical unit of distance equal to 9.5 trillion kilometers (5.9 trillion miles). It is defined as the distance light travels in an Earth year.
Storyboard Text
- LIGHT- YEAR A astronomical unit of distance equal to 9.5 trillion kilometers (5.9 trillion miles). It is defined as the distance light travels in an Earth year.
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