Alien life has already been proven to exist, just not in the way you mean. Tiny "bacteria" have been found on planets, which technically counts, as they are alive. spike6958Link?
Does alien life have to exist?
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Specimens have been chilled in liquid helium to -457°F (-272°C) absolute zero. They have also been heated to temperatures exceeding 300°F (149°C), Immersed in vats of liquid nitrogen, concentrated carbolic acid, hydrogen sulphide, brine, and pure alcohol, bombarded by deadly streams of electrons inside an electron microscope. Withstand over 1000 times more radiation than humans. Been recorded to survive over 150 years without water. sent into space After 10 days of exposure to space, the satellite returned to Earth. The tardigrades were retrieved and rehydrate to test how they reacted to the airless conditions in space, as well as ultraviolet radiation from the Sun and charged particles from space called cosmic rays. The vacuum itself seemed to have little effect on the creatures, but full exposure to the Sun's UV light, which is more than 1000 times stronger in space than on the Earth's surface killed some. Yet when removed from all of these incredibly hostile environments - which would have proven fatal for any other form of animal life - and moistened with water, these astounding creatures recovered. 
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