When it comes to aliens, everyone has an opinion despite no one having much of anything concrete to go on. Famed physicistEnrico Fermi famously looked up into the deafening silence of the night sky above Los Alamos National Laboratory in the 1940s and demanded to know where the hell everybody was.
If even one of the greatest minds of the 20th century was stumped, it's a good bet that we're not going to do much better at answering the question, "where are all the aliens?" There is still a lot to say about them though, and the idea of alien species on other worlds or in different realities is about as old as human thought.
For whatever reason, aliens have a hold of our imagination, and they frankly always have. So what do we mean when we talk about aliens? What are our best guesses on their appearance if they do exist? And, honestly, what are the odds that they're actually out there, and why should we care so much?\
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