There are 100,000,000,000 stars in our galaxy. Forget about intelligent life in the universe, in all likelihood there is intelligent life in our galaxy. So after 50 years, why hasn't SETI (Search for Extra-Terrestrial Intelligence) found anything? Not a blip, not a signal, nothing.
Many would say because there is nothing out there to find.
That's hard for me to accept. I'm a physicist who uses quantum mechanics to understand organic and inorganic chemistry. I study systems like DNA or hemoglobin from first principles to understand how they work. Believe me, although impressive, life isn't that miraculous, especially in it's beginning stages.
Life is more like a very stubborn organic chemistry reaction, that, if given enough time becomes more and more robust (and eventually specialized). To suggest carbon, nitrogen, hydrogen, etc. was only able to come together and form life here and no where else in our galaxy, when there are so many other places in our galaxy out there, seems.....well.....absurd.
So that begs the question, why haven't we made any progress on this? Why is there still a large number of people that believe that E.T.s belong in the same category as elves and goblins. Look, I'm not saying they are here or that they ever have visited us, I'm just saying odds are they are out there.
I think its time to change the approach. In the beginning, SETI's current approach of looking for unnatural radio signals from space was a good idea. But now we can do better. We've already identified hundreds of planets from beyond our solar system. I think it's time we take the next step and develop an aggressive spectroscopy program to analyze these extra-solar planets. Within a couple of decades of hard work we should be very good at identifying life on a planet from the planets spectrum. Furthermore we could make serious discoveries about the extra-solar planets in our galaxy.
Already molecules have been identified on extra-solar planets:
http://en.wikinews.org/wiki/Hubble_detects_methane_on_distant_planet
Think about it, chances are there is a lot more life than intelligent life in the galaxy (feel free to submit your own species-effacing joke here). I think we could make more of a case for searching for intelligent life if we first established simpler life outside of our solar system.
Anyway, that's my opinion.
http://www.seti.org/about-us/
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