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http://blogs.discovermagazine.com/badastronomy/2012/08/27/bafact-math-the-sun-is-400000-times-brighter-than-the-full-moon/#.Vr_37pN95TY
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http://blogs.discovermagazine.com/badastronomy/2012/08/27/bafact-math-the-sun-is-400000-times-brighter-than-the-full-moon/#.Vr_37pN95TY