مثال:
The “Great Filter” theory posits that other civilizations, potentially many, have existed during the history of the universe, but they all wiped themselves out before they got a chance to make contact with us.
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DailyBeast
Simply stated, the Great Filter says that intelligent interstellar lifeforms must first take many critical steps, and at least one of these steps must be highly improbable. Indeed, the premise of the Great Filter is that there’s at least one hurdle that is so high virtually no species can clear it and move on to the next. But while the term the Great Filter suggests the conscious action of some sort of exogenous entity, in reality, the hypothesis is more a way of thinking about the relative likelihood of certain events happening — or not happening — in their own natural course.
astronomy. com
Carl Brusse, from the Australian National University, said the Great Filter theory could explain why intelligent lifeforms out there in deep space — and here on Earth — had not managed to let each other know about their existence.
abc. net. au
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