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Search "Light-year"
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Light-year | |
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About 4 pages (1,215 words) in 3 products |
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Encyclopedia and Summary Information
summary from source:
 Light-year Information
1,128 words, approx. 4 pages
 A light-year or light year (symbol: ly) is a unit of measurement of length, specifically the distance that light travels in a vacuum in one year. While there is no authoritative decision on which year is used, the International Astronomical Union (IAU)... 
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Light-year | |
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About 4 pages (1,215 words) in 3 products |
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