NASA's Kepler space telescope is finding lots and lots of extrasolar planets. But how many might support intelligent life? And, is there a "sweet spot" in the galaxy where SETI astronomers should aim their telescopes?
I'd say we have already stumbled across that sweet spot three decades ago, but more on that later.
First, we need to understand what are the prerequisites for the evolution of life beyond microbes. Because we only have one example -- Earth -- extrapolations are dicey. For example, if completely water-covered worlds are more common than estimated, chances for advanced surface life go down. What's more, only surface dwellers could develop technological civilizations.
Read More: http://news.discovery.com/space/where-do-advanced-civilizations-hang-out-111003.html
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