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

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

See the evidence for yourself. ... Most compelling evidence of alien existence ... There are more registered sightings of UFOs than there is the word count here to  ...

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

Mar 12, 2017 ... Astrophysicists say 'fast radio bursts' may be evidence of interstellar ... the possibility that signs of alien life may have been out there all along.

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

Mar 31, 2017 ... The Crop Circles are often believed to be created by aliens, as there is no proper .... Will 2017 be year Donald Trump announces aliens exist? ... began, that tangible evidence of aliens existing would have been leaked.

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.express.co.uk/news/science/613184/Final-proof-aliens-exist-Nasa-photos-show-ancient-Hieroglyphs-carved-into-rock-on-Mars

Oct 20, 2015 ... ALIEN hunters claim to have found the historic 'final straw' of evidence that extra ... There are claims this resembles Mayan statues on Earth ...

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.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 ...