e/Great Filter

Information
has gloss	eng: The Great Filter is a hypothesis that concerns the implications of the Fermi paradox, and can be considered an explanation for what is called the "Great Silence". The failure to find any extraterrestrial civilizations in the observable universe implies the possibility that a "Great Filter" might act to reduce the great number of sites where intelligent extraterrestrial life might arise to the tiny number of intelligent species actually observed (currently just one: ours). This probability threshold, which could lie behind us or in front of us, might work as a barrier to the evolution of intelligent life, or a high probability of self-destruction. The main counter-intuitive conclusion of this observation is that the easier it was for life to evolve to our stage, the bleaker our future chances probably are.
lexicalization	eng: Great filter
instance of	c/Unsolved problems in astronomy