We haven’t found aliens yet, but if they were out there, would they even contact us?
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The Fermi Paradox
“Is there obvious proof that we could be alone in the Galaxy? Enrico Fermi thought so — and he was a pretty smart guy. Might he have been right? It’s been a hundred years since Fermi, an icon of physics, was born (and nearly a half-century since he died). He’s best remembered for building a working atomic reactor in a squash court. But in 1950, Fermi made a seemingly innocuous lunchtime remark that has caught and held the attention of every SETI researcher since.”
The Great Filter- Are We Almost Past It?
“Humanity seems to have a bright future, i.e., a non-trivial chance of expanding to fill the universe with lasting life. But the fact that space near us seems dead now tells us that any given piece of dead matter faces an astronomically low chance of begating such a future. There thus exists a great filter between death and expanding lasting life, and humanity faces the ominous question: how far along this filter are we?”
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