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National Research Foundation: How Far? How Big? How Many?
Using light as our measuring stick in space, science site provides all types of fun facts using light years and seconds as a reference.
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The Electronic Sky: Light Year
Electronic Sky site provides users with the definition of a light year as well as a light year conversion table.
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Nso: Astronomy: Light Year
Brief informational site provides the definition of a light year as well as a chart of "Light Times" from Earth.