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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.

Fermi paradox - Wikipedia

en.wikipedia.org/wiki/Fermi_paradox

The Fermi paradox or Fermi's paradox, named after physicist Enrico Fermi, is the apparent .... is "Why do we see no signs of intelligence elsewhere in the universe ? .... Sensitive alien obs...

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.

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 ... But there is no way to know for sure if aliens exist or not, that is until we ... may be over — the possibility we're no longer alone in the universe.".

Universe Has Probably Hosted Many Alien Civilizations: Study

www.space.com/32793-intelligent-alien-life-probability-high.html

May 5, 2016 ... Other planets throughout the universe probably hosted intelligent life long before ... Do you believe alien life exists elsewhere in the universe?

Six signs that aliens might exist - Technology & science - Space ...

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 ... for E.T. As kids stumble out of the theater, they might ask, do aliens exist? ... no direct proof for any life beyond Earth, but the universe is home to a lot of stars.

What are the odds aliens exist? | Science Wire | EarthSky

earthsky.org/space/odds-aliens-exist-drake-equation-kic8462852

Feb 3, 2016 ... For another, the likelihood that an alien civilization actually exists is still a ... Species within the Star Trek universe would typically be Type II.

Life in the Universe - Stephen Hawking

www.hawking.org.uk/life-in-the-universe.html

But I shall see what conclusions can be drawn, from the fact that life exists on this ... If this had been all that happened, all the matter in the universe would have ..... What are the chances that we will encounter some alien form of life, as we ...

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

www.yahoo.com/news/aliens-exist-heres-scientists-life-125700484.html

Apr 6, 2016 ... "I do believe that we will someday find other forms of life or a form of life, ... in the universe," Charles Bolden, who has been NASA Administrator since ... But there is no way to know for sure if aliens exist or not, that is until we ...

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 ... Aliens exist: Dragon particle proof of life on other planets ... claim the dragon particle is conclusive evidence of life elsewhere in the universe.