There should be aliens. But we haven't found them. This is kind of a problem.

Even using our lowest and most pessimistic estimates, there should be billions and billions of intelligent civilizations running around in the universe. Note: We use the term "intelligent," meaning that aliens should literally be bouncing about (at the very least) their respective solar systems. With so many alien civilizations running around, humans should have been contacted, right? Or at minimum, we should have found evidence  by now, perhaps some radio emissions or other signs of intelligent life. We should have seen them.

But we haven't.

READ NEXT: 10 Solutions to the Fermi Paradox

Even if we look to our own galaxy, there should be a plethora of aliens zooming about. There are some 100 billion planets in the Milky Way, and even if just a mere fraction are habitable (a modest estimate), that still means that there should be millions of planets with alien life and hundreds of thousands that have intelligent alien life. Why this life seems to be missing is the very heart of the Fermi Paradox.

The Fermi’s paradox addresses this apparent contradiction—the difference our estimates and the evidence (or lack thereof) for alien life.

Ultimately, a number of people have attempted to answer this question, one of the most important question in human history: “Where is everyone?” Here, Kurzgesagt – In a Nutshell gives you some answers.

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