Technically anything on our planet is “terrestrial” and not an alien, but it’s likely that there’s alien life on the moons of Saturn or Jupiter! Some of the moons like Enceladus, have a salty liquid ocean underneath the surface crust, and this contains organic molecules. This is the perfect environment for microbes to form!
I have been scuba diving many times in the Red Sea, and some of the sea creatures you see are so extraordinary they might as well be alien! You will find some wonderfully amazing creatures at the bottom of the ocean. But by definition they are not aliens because they come from planet Earth.
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