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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, ...

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

Mar 31, 2017 ... GLOBAL governments are preparing the world for an imminent announcement that intelligent aliens exist and are already here on Earth, it has ...

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 ...

www.upm.es/sfs/Rectorado/Vicerrectorado%20de%20Alumnos/Acceso/Bachillerato%20LOE/Ex%C3%A1menes/15J%20INGL%C3%89S.pdf

Do aliens exist on Earth? No one knows the answer for sure, but it is a question that has been debated for ages. If history is to be believed, aliens have been a ...

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 ...