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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/Extraterrestrial_life

Extraterrestrial life, also called alien life is life that does not originate from Earth. These hypothetical life forms may range from simple single-celled organisms to beings with civilizations far more advanced than humanity. Although many scientists expect extraterrestrial life to exist in some form, ...

www.independent.co.uk/news/science/aliens-universe-brexit-martin-rees-astronomy-britain-a7663891.html

Apr 5, 2017 ... 'My guess is that if we do detect an alien intelligence, it will be nothing like us ... We know now that planets exist around many, even most, stars.

www.independent.co.uk/news/science/aliens-enceladus-life-saturn-moon-cassini-mission-nasa-announcement-today-what-does-it-mean-a7681831.html

Apr 13, 2017 ... An icy moon in our own solar system could support life, according to new findings .

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

May 9, 2017 ... Our own example tells us nothing about the likelihood of life elsewhere, or what it would look like if it did exist. Could there be advanced alien ...

www.express.co.uk/news/weird/785923/The-Disclosure-Activists-aliens-exist-government-top-secret-cover-up-truth-embargo

Mar 31, 2017 ... Will 2017 be year Donald Trump announces aliens exist? ... began, that tangible evidence of aliens existing would have been leaked.

www.express.co.uk/news/science/814639/aliens-exist-scientists-breakthrough-ISS-samples-space

Jun 8, 2017 ... It has led to British space scientists reiterating claims that not only does life exist on other planets but that alien beings are continually coming to ...

www.express.co.uk/news/weird/748267/Mars-alien-sitting-down-NASA

Dec 31, 2016 ... 'I PROVED ALIENS EXIST' NASA image shows 'alien sitting down on .... He also tried to explain why he believes NASA would cover up the fact ...

www.thesun.co.uk/tech/2692554/are-aliens-real-these-unsolved-space-mysteries-could-prove-existence-of-extraterrestrials

Jan 24, 2017 ... IT'S the biggest question in the universe and scientists are no closer to answering it. Do aliens exist or are humans totally alone? Stargazers ...

www.newsweek.com/are-aliens-real-aliens-evidence-nasa-anonymous-628922

Jun 26, 2017 ... Anonymous Says NASA Has Evidence of Alien Life. .... that means they will be able to observe traces of extraterrestrial life, should they exist.