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What Is Life and Where Did It Come From?
How Many Aliens Are There?
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100 billion advanced aliens alien civilization alien signals Alpha Centauri Arecibo message atoms Beta Pictoris broadcast called carbon dioxide clouds color communicate cosmic created dark detect develop discovery distances E.T. Phoned Home earth earth's atmosphere exist faster Frank Drake frequencies fuel galaxy giant planets human hundred hydrogen inch intelligent interstellar Jansky Jupiter Karl Jansky lander large number laser laser beam life-forms light-ship light-years living things look Mars Martian META Milky moon Neighbor Worlds neutron stars night Observatory ocean orbit organic molecules oxygen picture probe Project OZMA pulses radiation radio astronomers radio energy radio signals radio telescope radio waves received Say Hello scientists Search for Extraterrestrial sent series of beeps Serious About SETI SETI solar system space spacecraft spaceship spectrum speed of light Suitcase SETI surface tele temperatures tiny trillions tune ultraviolet Venus visible light wavelength