Fermi Paradox: Where are the aliens?

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The Fermi Paradox seeks to answer the question of where the aliens are. 

Given that our solar system is quite young compared to the rest of the universe — roughly 4.5 billion years old, compared to 13.8 billion — and that interstellar travel might be fairly easy to achieve given enough time, Earth should have been visited by aliens already, the idea goes. 



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