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david grinspoon 
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Jan 03, 2020

alien    alien civilizations    alien life    aliens    biosignatures    david grinspoon    does intelligent alien life exist?    event horizon    event horizon john michael godier    fermi paradox    finding alien civilizations    godier    hidden aliens    intelligent alien life    intelligent life    is contacting aliens safe?    messaging extraterrestrial intelligence    meti    science    seti    should we contact aliens?    signal    space    technosignatures    universe    von neumann probes   

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