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What is a light-year and how is it used??
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What Is a Light-Year? | NASA Space Place – NASA Science for Kids
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What Is a Light-Year? | NASA Space Place – NASA Science for Kids
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Objectives: Learn what units scientists measure distances in space. Define and use an astronomical unit to measure distances in space. Define and use a. - ppt download
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Light-year - Wikipedia
what is light year in Hindi/Urdu||روشنی کی رفتار کتنی ہے |how much days in a light year | light year - YouTube
Lightyear
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What Is a Light-Year? | NASA Space Place – NASA Science for Kids