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What is a light-year?
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Light-year - Wikipedia
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Astronomical Unit compared to a Light-Year - YouTube
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What Is a Light-Year? | NASA Space Place – NASA Science for Kids
What Is a Light-Year? | NASA Space Place – NASA Science for Kids
1 light year is equal to how many years of the Earth? - Quora
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What Is a Light-Year? | NASA Space Place – NASA Science for Kids
