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Accidental Origin Theories
Existence of Extrasolar Planetary Systems
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ability animal appear artificial intelligence assumed astronomical atmosphere automaton billion binary biological evolution biological society brain capable Cepheid variable characteristics chemical chemical evolution complex detect digital computer distance DP DP DP Earth electronic elements energy environment evidence evolved exist explosion extrasolar intelligence extrasolar planets extraterrestrial factors fossil function galactic galaxy Homo Homo erectus human increased information patterns information processing intelligent automata intelligent biological intelligent societies interstellar communication large number light logical main sequence Mars mass meteorite miles Milky molecules Moon natural neurons optical orbit organisms origin oxygen Palomar Observatories period physical planetary systems planets possible primitive probably probes problem proteins radiation radio result RP RP RP scientific sequence signals social Solar System space spaceship species stars stellar storage supernova surface synthetic automata synthetic intelligent technological temperature theory thinking process tion Tungus velocity white dwarfs