NASA scientists have explained in a new paper why they believe it’s likely we haven’t ever encountered intelligent extraterrestrial life — and it’s heartbreaking.
All intelligent life, they argue, has likely destroyed itself before reaching a sophisticated enough point in evolution to support such an encounter. And the same fate likely awaits humans unless we take action, they believe.
The “Great Filter” theory — as in “filtering out” various forms of life — argues that other civilizations, possibly several, have existed during the life of the universe. But they all destroyed themselves before they could make contact with Earth, noted the paper, “Avoiding the ‘Great Filter’: Extraterrestrial Life and Humanity’s Future in the Universe.”