A new theory on why we don't see more life (much less alien civilizations) argues that life might arise easily, but go extinct within a billion years of planetary formation.
source: extremetech
Where are all the aliens? Maybe they’re mostly microbial (and dead)
A new theory on why we don't see more life (much less alien civilizations) argues that life might arise easily, but go extinct within a billion years of planetary formation.
source: extremetech