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en.wikipedia.org/wiki/Fermi_paradox

The Fermi paradox or Fermi's paradox, named after physicist Enrico Fermi, is the apparent contradiction between the lack of evidence and high probability ..... It may be that while alien species with intelligence exist, they are primitive or have not ...

www.space.com/32793-intelligent-alien-life-probability-high.html

May 5, 2016 ... The probability of a civilization developing on a potentially habitable alien ... of extraterrestrial civilizations that may exist today in the Milky Way.

earthsky.org/space/odds-aliens-exist-drake-equation-kic8462852

Feb 3, 2016 ... For one, mysterious behavior is not enough to conclude the cause is aliens. For another, the likelihood that an alien civilization actually exists is ...

www.nytimes.com/2016/06/12/opinion/sunday/yes-there-have-been-aliens.html

Jun 10, 2016 ... Among scientists, the probability of the existence of an alien society with which we might make contact is discussed in terms of something ...

www.scientificamerican.com/article/what-is-the-probability-that-alien-life-exists

Mar 11, 2017 ... Are we alone in the universe? If so, why? If not, where is everybody? Thankfully, math can help us with these astronomically profound ...

the1a.org/shows/2017-05-09/jim-al-khalilis-aliens

May 9, 2017 ... Indeed, what were the chances of their parents meeting, and so on all ... What life on Earth can tell us about alien existence elsewhere in the ...

www.airspacemag.com/daily-planet/odds-were-only-technologically-advanced-species-universe-are-extremely-low-180958975

May 3, 2016 ... Frank and Sullivan ask: What is the chance that we are the only ... develop a technology that releases detectable signs of their existence into space. .... We will judge aliens by their ability to travel through space and they may ...

www.popsci.com/technologically-advanced-aliens-have-probably-already-existed

Jun 13, 2016 ... What are the odds that the universe is home to advanced alien ... asking how many civilizations currently exist, we asked what the probability is ...

www.forbes.com/sites/briankoberlein/2016/01/25/what-are-the-odds-that-aliens-exist

Jan 25, 2016 ... For one, mysterious behavior is not enough to conclude the cause is aliens. For another, the likelihood that an alien civilization actually exists is ...