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What is a light-year?
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Light-year - Wikipedia
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How to Calculate a Light Year: 10 Steps (with Pictures) - wikiHow
How to Calculate a Light Year: 10 Steps (with Pictures) - wikiHow
How far is a light-year? | Astronomy Essentials | EarthSky
How far is a light-year? | Astronomy Essentials | EarthSky
What Is a Light-Year? | NASA Space Place – NASA Science for Kids
How long is a light-year?
How far is a light-year? | Astronomy Essentials | EarthSky
