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Key terms:
planets
extraterrestrial
worlds
europa
gliese
seti
titan
habitable
esa
intelligent
extraterrestrial life
planetary
microbial
probes
solar system
astronomer
alien life
methane
extrasolar planet
morphology
other planets
liquid water
sightings
biochemical
microbes
meteorite
enceladus
heavens
thinkers
purified
habitable zone
astrobiology
life on mars
conducive
cosmology
intelligent life
life on earth
carl sagan
rare earth
microbial life
could exist
innumerable
other worlds
giordano bruno
drake equation
kepler mission
living entities
science fiction
terrestrial planet finder
planetary habitability
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