This is crazy, but bear with me. Let's say the next mission to the Moon brings a cable. One that's still attached to Earth. They anchor it on the lunar surface. As the bodies move in relation to each other, the cable is tugged by the Moon's incredible mass through a station on Earth that uses the movement to turn gears and such and generate energy. With F = ma, and the m being so huge, that's some serious force without having any significant effect on the Moon. Is this physically possible? The distance to the Moon is an average of 384K km and varies from about 363K km to 405K km. TYCO says: Manufactured 860 million feet (about 280K km) of cabling products - enough to span the globe more than six times. (http://www.tyco.com/livesite/Page/Tyco/Careers/University+Recruiting/Fast+Facts) According to my math, TYCO's cables alone (for one year, I believe) make up 70% of the distance to the Moon at its farthest from Earth. Is this totally impractical? What do you think?