Here I will be discussing and sharing actual physical evidence of extraterrestrial life and showing proof of other possible living organisms from different planets. Not all these are necessarily from what you have seen or heard of from scifi or hollywood movies. 
1. Archaea 
Archaea are a type of bacterias that are Prokaryotic in other words meaning they are singled celled organisms with no nucleus or any membrane bound organelle. In other words membrane bound meaning it lacks any of the cell structures Eukaryotes have like most living organisms have which are multi celled organisms like ourselves. All though this specific type of organsim isn't relatively new in the scientific community, what was was that not until 1998 scientists didn't know that there were some living organisms that were in hydrothermal vents which is an opening in the sea floor out of which water flows that has been heated by underlying magma. And not too long ago they found Eukaryotic animals there too such as shrimp, crabs and even sharks. these bacteria though had been discovered that they are actually capable in living inside Volcanoes. Thus proving that there could be life on different planets where no other living creatures on Earth could adapt or survive in. https://archives.microbeworld.org/microbes/archaea/where.aspx
2. Incident of Roswell New Mexico

On July 8, 1947 the Roswell Army Field in New Mexico public information officer Walter Haut, issued a press release stating that a personnel from the field's 509th Operations Group had recovered a flying disc, which had crashed on a ranch Near Roswell. The military decided to concel the true purpose of the crashed device for nuclear test monitoring and instead inform the public that the crash was a weather balloon later that day. Kevin Randle a lieutenant colonel who served during the Vietnam war and 2nd Gulf war wrote a book alongside Donald Schmitt the co aurthor of the book called UFO Crash at Roswell. In their book they explained how several witnesses during the incident described being turned back from the Foster ranch by armed military police. Supposedly there were actually over 300 witnesses, but only 23 could be counted for as legit reliable stories since most witnesses did not have first hand knowledge of the incident. And the other problem with the witnesses stories who saw this incident "first hand" made contradictory claims. Whether or not this was all a hoax or not it still remains as a hot topic debate to this date.
3. Kepler -62e and -62f 
Planet Kepler -62e and f were discovered in 2013 by astronomers they were found by NASA's Kepler spacecraft. They orbit an orange star called Kepler-62. This star is slightly smaller and cooler than our sun. These two planets orbit the start every 122 and 267 days. These two planets are comprised of oceans you can read more about it on here or wikipedia. https://www.dailygalaxy.com/my_weblog/2013/07/two-alien-planets-with-endless-oceans-unlike-anything-in-our-solar-system-.html
4. Life on Mars 
Methane on Mars was discovered in 2003 and is the simplest organic molecule, much of the methane in the Earth's atmosphere is produce by life. Scientists also found what they believe to be bacteria from a Mars meteorite.
5. Men in black? 
Unlike the Men in Black you hear or have seen in the Hollywood movies, the real Men in black are men dressed in black suits who claim they are government agents who harass or threaten UFO witnesses to keep them quiet about what they have seen. A ufologist John Keel claimed to have had encounters with men in black and referred to them as demonic supernaturals with dark skin and exotic facial features.
Because there are one hundred billion galaxies in the universe and you think Earth is the only planet with life on it?
That is my stance on extraterrestrial life.
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