Well, suppose hypothetically there is another civilization that reached the point we are at now over 100,000 years ago, and they happen to reside near a star that is a million light years away. In such a scenario, we won't hear a peep from them for another 900,000 years.
The only other possibility is that they use some form of communication that is faster than light, which would mean they are using something other than EM based communication. EM based communication is all that we have the capability of looking for.
Due to the sheer size of the known universe, it is inevitable that there is sentient life beyond earth. Even if what we have here is merely a pattern of chemicals, that pattern is bound to have repeated elsewhere, if not identically then very similarly.
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/3IW8LujJxMY/story01.htm
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