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| Physics - Formulas - Brightness |
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Light-Years (ly) Parsecs (pc) An astronomical unit is the mean distance between the Earth and the Sun. A light-year is the distance light travels in 1 year - ~300,000 m/s. http://astronomyonline.org/Science/Brightness.asp?Cate=Home&SubCate=MP01&SubCate2=MP040219 |