Do Aliens Go Invisible by 'Going Green'? : Discovery News: "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."
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