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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.

Extraterrestrial life - Wikipedia

en.wikipedia.org/wiki/Extraterrestrial_life

Extraterrestrial life, also called alien life is life that does not originate from Earth. These as-yet-hypothetical life forms may range from simple bacteria-like organisms to beings with civilizati...

Do Aliens Really Exist? | Discovery Kids

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 ...

Do aliens really exist? | Reference.com

www.reference.com/world-view/aliens-really-exist-b0e429766ecd44a9

There is no scientific proof that aliens or other forms of intelligent life exist elsewhere in the universe, despite many purported UFO sightings around the world.

Do Aliens Exist? Here's What Scientists Say About Life on ... - Mic

mic.com/articles/139828/do-aliens-exist-here-s-what-scientists-say-about-life-on-other-planets

Apr 6, 2016 ... Read more: Why 7 Experts Are Convinced Alien Life Might Really Exist ... But there is no way to know for sure if aliens exist or not, that is until ...

www.ask.com/youtube?q=Aliens Really Exist&v=shEd9FCc9w0
Oct 22, 2016 ... 5 Space Discoveries & Mysteries That Could Prove Alien Life Exists See Also: रहस्यमय Nibiru ग्रह और वहां से एलियंस आने की ...

Do aliens really exist? - Quora

www.quora.com/Do-aliens-really-exist-16

Yes. But this is not something that you should take anybody's word on in a forum such as this. You need to do a little information gathering of your own. I would ...

Do Aliens Exist? Yes, The Universe Is Full Of Life, NASA Astronaut ...

www.ibtimes.com/do-aliens-exist-yes-universe-full-life-nasa-astronaut-says-2414180

Sep 10, 2016 ... Leroy Chiao has completed four missions into space and performed six spacewalks. Aliens are out there, he said.

Proof aliens exist: Scientists make staggering discovery find ...

www.express.co.uk/news/nature/518510/Aliens-do-exist-scientists-find-proof-of-life-in-space

Oct 6, 2014 ... THIS astonishing image is the long-awaited proof that alien life DOES exist, scientists have sensationally claimed.

Do Aliens Really Exist? - Universidad Politécnica de Madrid

www.upm.es/sfs/Rectorado/Vicerrectorado de Alumnos/Acceso/Bachillerato LOE/Exámenes/15J INGLÉS.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 ...