Related articles:
Milky Way
Planetary habitability
Extraterrestrial life
Rare Earth hypothesis
Gliese 581
Water
Gliese 581 d
Red dwarf
Planetary system
Terrestrial planet
Planet
Extrasolar planet
Key terms:
life
stars
planets
earth
zona
our
system
habitable zone
galaxy
ghz
galactic
likely
planetary
far
too
must
within
believed
europa
complex
location
maintain
scientists
terrestrial
necessary
concept
solvent
billion
heavier
goldilocks
conditions
assuming
elements
distance
all life
environment
galactic center
solar system
extrasolar
astronomers
liquid water
life on earth
planetary system
galactic habitable zone
circumstellar habitable zone
planetary habitability
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