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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 .... 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 ...

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

Jan 24, 2017 ... Do aliens exist or are humans totally alone? ... Water provides the conditions needed for life – so there could have been living organisms on ...

heatst.com/tech/weird-unexplained-phenomenon-may-be-proof-that-aliens-are-jetting-around-space

Mar 12, 2017 ... A team of Harvard scientists is now considering the possibility that signs of alien life may have been out there all along. Astrophysicists at the ...

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 ... Shostak notes that there is no direct proof for any life beyond Earth, but the ...

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 ... Scientists discover earliest evidence... Read More .... 'There's a fight coming' in season 3 of.

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

Storage Wars. Find out more · Ancestry - Single MPU · Counting Cars. New episodes weeknights 8pm · Forged in Fire. Thursdays at 9pm · American Pickers.

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

Mar 31, 2017 ... EXCLUSIVE: World is 'about to be told ALIENS EXIST and are HERE on EARTH' ... organisation, added: "All of the evidence that has been accumulated ... The Crop Circles are often believed to be created by aliens, as there ...

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 .... are convinced they are finding genuine evidence of life in the pictures.

www.theblackvault.com/casefiles/mexican-government-releases-proof-of-alien-existence

(INTELLIHUB) — Newly released Mayan documents, i.e. artifacts, dating back at least 1300-years reveal that the human race is not alone and highly advanced ...