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There is no night in free space, and no clouds or atmosphere to block sunlight. Light intensity obeys an inverse-square law . So the solar energy available at distance d from the Sun is E = 1367/ d 2 W/m 2 , where d is measured in astronomical units (AU) and 1367 watts/m 2 is the energy available at the distance of Earth's orbit from the Sun, 1 AU.
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