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I don't think many people would seriously suggest that there are no alien civiliations out there. There are something like 300,000,000,000 stars in our galaxy, and at least the same number of galaxies. We now know that planetary systems are the norm, rather than (as was thought at one time) the exception. To suggest that we are the only planet in the entire universe which has developed intelligent life really is the most monstrous egotism.
However, whether or not interstellar communication, let alone interstellar travel, is feasible, is an entirely different question.
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