Search results
Results From The WOW.Com Content Network
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 ...