Quote:
Originally Posted by KagatobLuvsAnimu
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A huge number that's still much smaller than the number of stars in the universe, still smaller than the number of stars that have planets.
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this is just science trying to use its current knowledge to make a guess for people who want to know, Toofliss, but
on February 2, 2011, the Kepler Space Observatory Mission team released a list of 1,235 extrasolar planet candidates, including 54 that may be in the "habitable zone."[8][9][10] Based on these latest Kepler findings, astronomer Seth Shostak estimates that "within a thousand light-years of Earth" there are "at least 30,000 of these habitable worlds."[11]
http://en.wikipedia.org/wiki/Goldilocks_planet
Also the Drake Equation!
http://en.wikipedia.org/wiki/Drake_equation#Usefulness