As we discover more and more planets around other stars, the Fermi Paradox is becoming, well, more paradoxical.
The Fermi Paradox simply asks the question "where are they?" Our Milky Way galaxy is so big and so old -- and we are estimated to be accompanied by at least 100 billion planets -- that aliens should have visited us by now.
Instead, when we peruse the heavens, we are faced with the Great Silence, which is one of the biggest challenges to modern astronomy.
There have been numerous solutions to the Fermi paradox, but none of them are satisfactory.
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