No one is sure that aliens exist. There could be tiny bacteria or organisms like us, maybe no life at all. I got this from a national national geographic.
Our ideas about extraterrestrial life are what Sagan called "plausibility arguments," usually shot through with unknowns, hunches, ideologies, and random ought-to-bes. Even if we convince ourselves that there must be life out there, we confront a second problem, which is that we don't know anything about that life. We don't know how truly alien it is. We don't know if it's built on a foundation of carbon atoms. We don't know if it requires a liquid-water medium, if it swims or flies or burrows.
http://science.nationalgeographic.com/science/space/solar-system/life-beyond-earth.html
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