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Are We Alone?
Stars and Planets
Life in the Solar System
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advanced civilizations alien Arecibo asteroids astronauts atmosphere Barnard's star beacon beam Betty Hill Betty Hill's binary blast British Interplanetary Society carbon dioxide Carl Sagan century Ceti chemical Chryse clouds colonies comet companion craft Cyclops cylinder Daedalus Daniken detected diameter dish distance Dogon double star Drake equation dust Earth Epsilon existence explosion extraterrestrial galactic Galaxy heat hydrogen Icarus interstellar communication Jupiter kilometers Lagrangian points LDEs light light-years lunar Mars mass meteorite meters million Moon nuclear nutrient O'Neill object Observatory orbit organic Phobos photographs planetary system planets possible probe produced Pyramid radiation radio astronomers radio telescope radioactive reaction reported Reticuli rotation Sagan sample satellites Science scientists SETI solar system Soviet space space colonization spacecraft sphere star map star's starships sunlight surface Tau Ceti technological temperature tion transmissions transmitting Tunguska Tunguska event Venus Viking wavelength Zeta Zeta Reticuli