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Can you explain, what is a light year, in the most simple way? - Quora
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Light year: What is a light year and How long is a light year
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What is a light-year?
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light-year - Students | Britannica Kids | Homework Help
What Is a Light-year? | HowStuffWorks
What Is a Light-Year? | NASA Space Place – NASA Science for Kids
What Is a Light Year?? - YouTube
