Related terms:
seti
probes
planets
carl sagan
frank drake
fermi paradox
planetary
life on earth
interstellar
intelligent
radio telescope
intelligent life
civilizations
extraterrestrial
anthropic principle
extraterrestrial life
interstellar communication
extraterrestrial civilizations
extraterrestrial intelligence
Wikipedia sources:
Drake equation
SETI
Fermi paradox
Extraterrestrial life
Context for words:
drake
equation
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