Fermi paradox

Discrepancy between lack of evidence of advanced alien life and apparently high likelihood it exists

The Fermi paradox is the discrepancy between the lack of conclusive evidence of advanced extraterrestrial life and the apparently high likelihood of its existence. As a 2015 article put it, "If life is so easy, someone from somewhere must have come calling by now."

This keyword could refer to multiple things. Here are some suggestions: