First off, don't start to accuse of me techno fetisjism, I have no idea how we ever going to reach these new world, if ever.
However I've been very interested in the "terrestrial planet finder - project" and just found out that the launch date for it has been pushed back from what I believe was 2018, to 2012-2015:
$this->bbcode_second_pass_quote('', 'T')he Terrestrial Planet Finder (TPF) uses a small collection of high sensitivity telescopes (probably 4 large 3.5-meter telescopes) with revolutionary imaging technologies. It will measure the temperature, size, and the orbital parameters of planets as small as our Earth in the habitable zones of distant solar systems. Also, TPF's spectroscopy will allow atmospheric chemists and biologists to use the relative amounts of gases like carbon dioxide, water vapor, methane and ozone to find whether a planet might support life. Launch is anticipated between 2012-2015.



