Proposed Answers to the Fermi Paradox: A Concise Compilation from Great Filters to Cosmic Zoos

To the point

Many explanations for the Fermi Paradox exist, ranging from there being no paradox at all or civilizations that are too far or hidden to detect, to ideas like a great filter, Earth’s special conditions, or the possibility that we are living in a simulation.

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Henry Oliver - A list of solutions to the Fermi Paradox

As Tim Urban says, ‘We’d estimate that there are 1 billion Earth-like planets and 100,000 intelligent civilizations in our galaxy.’ So there must be aliens. Why haven’t we heard from them? (Read about the Fermi Paradox here.)