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After all of This Time Searching for Aliens, is it The Zoo Hypothesis or Nothing?
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There are also hundreds of other theories that can potentially explain it. Like, 100 years really isn't a long time on cosmic scales. Maybe we're late to the party and intelligent life wiped itself out already. Maybe we're early, and we will wipe ourselves out before a new intelligence even figures out where the copy paper is.
For as big as space is, time is bigger.