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Apollo Apollo program astronauts astronomers atoms automatic back to Earth billion brought building cargo rockets celestial body center of mass compartment conduct craters distance Earth satellite Earth-Moon Earth's atmosphere Earth's surface electric electronic energy equipment experts fifty flight force fuel G. P. PUTNAM'S SONS gases gravity hicle industries instruments laboratory landing launching libration liquid living lunar base lunar city lunar colony Lunar rover lunar surface means meteor meteorites miles minerals minor planet missile Moon City moon colony moon exploration moon rocks moon's surface mountains observatory operation Orbit—An orbit oxygen particles perhaps planet possible pounds pressure probe propulsion radiation radio recycling return to Earth rocket engine satellite's scientific scientists shelter solar sails solar system solar-cell space program space shuttle space station space vehicle spaceship spatial body station in orbit supplies technicians television temperature things thrust tion United vast velocity weather forecasting