It has recently been established that many stars have planets orbiting around them. Given that some of them may be about the same distance out from their star, have a similar temperature range and a similar chemical composition to the Earth, it is quite likely that life has evolved out there somewhere. However the way we have evolved is really down to a series of coincidences, such as a large meteor striking the Earth and wiping out the dinosaurs, so it is unlikely that the aliens will look anything like us. As to intelligent life, that is anyone's guess.
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