A team out of 's Jet Propulsion Laboratory has posed a theory as to why we have not yet met any .In a introducing the 'Great Filter' theory, five NASA researchers posit that other civilizations may very well have existed throughout the history of the universe, but have all wiped themselves out prior to making contact with us.The theory extends to suggest that we too may be on track to wipe - or 'filter' - ourselves out. The bright side being that if we come to understand that or even how other civilizations destroyed themselves, we can avoid the same fate.
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