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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. .... Alien life, such as microorganisms, has been hypothesized to exist in the .... There is evidence that Mars had a warmer and wetter past: dried-up river beds, ...

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

Jan 24, 2017 ... Check out the astonishing space discoveries which have left baffled stargazers scratching their heads.

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

Jun 8, 2017 ... Scientists find 'PROOF' aliens exist as samples from ISS reveal .... The Crop Circles are often believed to be created by aliens, as there is no ...

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

"I doubt that there are any aliens that close," Shostak says. ... Shostak notes that there is no direct proof for any life beyond Earth, but the universe is home to a lot  ...

www.dailymail.co.uk/video/sciencetech/video-1195355/Does-NASA-footage-prove-aliens-exist.html

Does this NASA footage prove that aliens exist? Space station shows mysterious objects leaving earth.

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

This has led many believers to suggest there's a cover up afoot. Clinton has been consistently vocal on the existence of aliens and it's worth noting his opinions ...

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

Jun 26, 2017 ... Anonymous Says NASA Has Evidence of Alien Life. ... able to identify the specific location where life might be most likely to exist outside Earth.

www.thealternativedaily.com/five-recent-signs-of-aliens

Feb 2, 2017 ... In all probability, somewhere deep in space there is a sun much like our ... Podesta fell short of confirming that aliens exist — or that the U.S. ...

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 ... Could there be advanced alien civilisations out there or would they only be in ..... Is there obvious proof that we could be alone in the Galaxy?