the Fermi Paradox. If you’ve never heard this catchy little jingle before, here’s how it goes: given that there are billions of stars in the galaxy quite similar to our good old familiar standby sun, and that many of them are quite a bit further on in years than the big yellow lady, and the probability that some of these stars will have planets quite similar to our good old familiar knockabout Earth, and that such planets, if they can support life, have a high likelihood of getting around to it sooner or later, then someone out there should have sorted out interstellar travel by now, and
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