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Why else would we not have encountered them by now?
Goldilocks, eat your heart out.
He gets this a lot.
Less "E.T." and more "Aliens."
For icy ocean worlds, there's no sky to explore.
How could we be blind to alien observers?
He has reason to believe we're close.
Elon Musk and Stephen Hawking think it's a bad idea.
Did humanity pass the filter yet?