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A sun-like star is barely visible to naked-eye observers on earth when it is a distance of 7.0 light years, or 6.6 x 10' m,

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A sun-like star is barely visible to naked-eye observers on earth when it is a distance of 7.0 light years, or 6.6 x 10' m, away. The sun emits a power of 3.8 x 1026 W. Using this information, at what distance would a candle that emits a power of 0.20 W just be visible? Express your answer with the appropriate units. (B o=

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