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What Is a Light-Year? | NASA Space Place – NASA Science for Kids
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Chandra Press Room :: New Exhibit Launches to Celebrate the International Year of Light :: 29 January 15
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Can you explain, what is a light year, in the most simple way? - Quora
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Scientists Say: Light-year | Science News for Students
International Years
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Light-year Definition (Illustrated Mathematics Dictionary)
2015 – International Year of Light and Light-Based Technologies
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What Is a Light Year? Definition and Examples
