A study of plate tectonics and magnetic fields on rocky planets shows why Earth is the right size for these processes to occur, making it amenable to life
http://feeds.newscientist.com/c/749/f/10898/s/6064bac/l/0L0Snewscientist0N0Carticle0Cmg20A3272430B60A0A0Eearthsized0Eplanets0Eare0Ejust0Eright0Efor0Elife0Bhtml0DDCMP0FOTC0Erss0Gnsref0Fspace/story01.htm
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