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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 ... alien-abduction-2.jpg 'My guess is that if we do detect an alien intelligence, it will be nothing like us. It will be some sort of electronic entity,' ...

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

May 9, 2017 ... What life on Earth can tell us about alien existence elsewhere in the Galaxy is limited by the fact that we have a statistical sample of just one.

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.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? Truth about aliens will soon be revealed, says expert. Recently there is a systematic ...

www.nbcnews.com/id/28148553/ns/technology_and_science-space/t/six-frontiers-alien-life

With so many stars, alien life is probable; Water worlds abound in our solar system ... for E.T. As kids stumble out of the theater, they might ask, do aliens exist?

www.history.co.uk/shows/ancient-aliens/articles/do-aliens-exist-most-compelling-evidence-of-alien-existence

Some say it's obvious we're not alone, others scorn the very idea and still others yet will hauntingly report their own experiences of alien probings following their ...

oxplore.org/question-detail/281

Although maybe they have and we've missed it - or we can't understand them. And surely it's big-headed to think we're the only life in the universe? Hmmm..

.ask.com/youtube?q=What+Do+Aliens+Exist&v=WvBAHeSSM6U
May 24, 2017 ... Let us know if you think aliens exist. Watch the full episode here: ... if aliens did exist, trump would have proposed a wall by now. Read more.