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What is a light-year? 1 light-year = 9.4605284 × 1015 meters | kiranvoid
Astronomer's Tools Discovery Through Technology. Humans have created many tools to help explain the mysteries of the universe. Sun dials help tell time. - ppt download
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How far is a light-year? Plus, distances in space
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time - How long did it take for the universe to become 1 one light year? - Physics Stack Exchange
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