It takes more than just temperature and an iron core to make a planet hospitable for life. The 100% certainty by one scientist is ludicrous wishful thinking. If two planets have life an atheist scientist will say, there goes God and a privileged Earth. To understand what a life-giving planet must be like read both 'Real Earth' and 'Privileged Planet'. > > http://www.foxnews.com/scitech/2010/09/29/odds-life-newfound-earth-size-planet-percent-... is an excellent discussion of the requirement of stability for a planet in order to produce life. This is further evidence that our planet is rather unique:- http://online.wsj.com/article/SB10001424052748703954004576089942711749766.html?KEYWORDS...