Rare earth
why complex life is uncommon in the universe
Exobiology
Life, origin
Popular science
Science (General)
Life
Origin
Life on other planets
Astronomy
Long Now Manual for Civilization
"While it is widely believed that complex life is common, even widespread, throughout the billions of stars and galaxies of our Universe, astrobiologists Peter D. Ward and Donald Brownlee argue that advanced life may, in fact, be very rare, perhaps even unique.". "Ward and Brownlee question underly…
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