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An Earth -based telescope with an aperture diameter of 0.7 m collects light energy from a...

An Earth -based telescope with an aperture diameter of 0.7 m collects light energy from a star at a rate of 14.0 picowatts. If the star is known to emit power in the form of visible light at a rate of 2.01 x 1024 watts. How distant is the star? Give your answer in light-years. A light year is 9.461 x 1015 m.

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