+The **Great Filter** is a hypothesis in astrobiology proposing that something dramatically limits the prevalence of observable [Alien Life](/wiki/alien_life) in the universe. It suggests a "filter" or barrier that prevents most life, including advanced [Civilization](/wiki/civilization), from reaching a stage where it could be widely detected, thus offering a possible solution to the [Fermi Paradox](/wiki/fermi_paradox). This barrier could be in our past, meaning we have already passed it, or it could lie ahead, posing a future existential challenge.
+## See also
+- [Fermi Paradox](/wiki/fermi_paradox)
+- [Rare Earth](/wiki/rare_earth)
+- [Existential Risk](/wiki/existential_risk)
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