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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 .... that this small planet really is the one special place, the single pale, blue dot ...

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? ... 'US government planning to reveal aliens exist before Obama leaves' ..... us to believe that they're here to help us and our planet when they really want to destroy it.

www.express.co.uk/news/weird/769014/Donald-Trump-aliens-exist-2017-The-Disclosure-Activists-Russell-Calka-Dr-Lisa-Galarneau

Feb 18, 2017 ... ... will become the first US President to break an alleged 'truth embargo' and reveal to the world this year that aliens really exist and are visiting ...

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

Jan 24, 2017 ... Once these puzzles are solved, we may have finally proved that aliens exist - or got one step closer to discovering that humanity is the only ...

discoverykids.com/articles/do-aliens-really-exist

UFO is the acronym the Air Force uses for any unidentified flying object, but it's become synonymous with alien spacecraft. There are tons of UFO sightings on ...

www.disclose.tv/news/NASA_confirms_Extraterrestrial_life_DOES_exist_on_other_planets/112979

NASA finally confirms Extraterrestrial life DOES exist on other planets. Share 48.3 K. Aliens really do exist! The idea of aliens has long been a conspiracy theory ...

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. ... "Life can adapt to really tough conditions and, of course, most of the universe is going to be filled ...

www.livescience.com/59331-aliens-have-visited-earth-robert-bigelow-says.html

Jun 1, 2017 ... Could intelligent alien life really exist on Earth and we wouldn't know about it? Not likely, according to Seth Shostak, a senior astronomer at the ...