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What is a Light Year? - ppt download
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Lightyear One - Wikipedia
Can you explain, what is a light year, in the most simple way? - Quora
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What Is a Light-Year? | NASA Space Place – NASA Science for Kids
How far is a light-year? | Astronomy Essentials | EarthSky
LogIQids - #LearnWithLQ - What is a Light Year? Popular misconception makes one believe that a light-year is a unit of time. However, it is an astronomical unit of distance. One light-year
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