dsgrue3 on 06 March 2013
Some people in this thread forget that our evolution took us from a single-cell to the humans of today. Similar processes would take place on other planets, and arguably more often due to atmospheric and environmental shifts.
As of April 2011, Kepler has discovered 1,235 possible planets, with 54 of those candidates located within the Goldilocks zone.
Estimates of 500 million "Goldilocks Planets" make life vastly more probable than not.
