What is a “Great Filter”?

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A great filter is an event that prevents a species from evolving any further by wiping it out.  It’s usually referenced in the context of finding intelligent, alien life somewhere else in the universe.  A lot can be said about this topic, but to make this short, it is simply an event that wipes out a species.  When dealing with technologically advanced species, like humans, a great filter event could be self-made, like nuclear war or it could be natural, like an asteroid impact.

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