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There is no known evidence for the existence of extraterrestrial life forms similar to humans, but many theorize that they exist.
A new microorganism recently discovered by NASA, which is able to thrive and reproduce using the toxic chemical arsenic, gives more plausibility to the theory that other planets might sustain life.

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 ...

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.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.

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 ...

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 ... that develop a technology that releases detectable signs of their existence into space. .... Unless of course one has been the victim of alien abduction.

www.hawking.org.uk/life-in-the-universe.html

Two questions I shall discuss are, 'What is the probability of life existing else where in ... because they are parasites, and can not exist independently of their hosts. ..... What are the chances that we will encounter some alien form of life, as we ...

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

Jan 25, 2016 ... Recently the star KIC 8462852 (aka Tabby's Star) has made news again because of its strange behavior. Possible explanations for its varying ...