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Rare Earth: Why Complex Life is Uncommon in the Universe
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These are the most frequently used words in this book.
ago
although
animal
appear
atmosphere
between
billion
body
cambrian
carbon
cell
changes
chemical
complex
conditions
during
early
earth
effects
elements
energy
environment
even
events
evolution
evolutionary
exist
explosion
extinction
far
first
form
formation
formed
fossils
found
galaxy
great
habitable
history
however
impact
important
jupiter
known
land
large
less
life
long
major
mars
mass
material
may
might
million
moon
new
now
number
occurred
oceans
orbits
organisms
oxygen
perhaps
period
place
planet
planetary
plate
process
rare
rate
record
regions
rocks
sea
small
solar
space
species
stars
still
sun
surface
system
tectonics
temperature
thus
time
today
two
universe
water
world
years
yet
zone
