Star Trek's "Borg" and Stargate's "Goa'uld" summarize a famous argument why there is no (other) intelligent life in this galaxy: if there were, they would have overrun the galaxy by now and their existence would be completely obvious to us. Assuming a civilization expands on the average taking a millenium to travel just one light year, it would only take 100 million years to conquer the galaxy (100,000 light-years diameter), which is but an eyeblink in astronomic time.
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