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Extraterrestrial life is the past or present existence of life originating outside the limits of the Earth. Currently, extraterrestrial life remains hypothetical, as there is no evidence of extraterrestrial life that has been widely accepted by the scientific community. Some, however, point to moons of Jupiter or Saturn (most notably Europa and Titan respectively, which are believed by scientists to have oceans of water under their icy surfaces) or other celestial bodies that might conceivably have some forms of life (bacterial or otherwise).

Most scientists think that if extraterrestrial life exists, its evolution occurred independently, in different places. An alternative hypothesis, held by a minority, is panspermia. This suggests that life could have been created elsewhere and spread across the universe, between habitable planets. These two hypotheses are not mutually exclusive.

That is from Wikipedia. Seems the jury is out on this one. No one know for sure.