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I was always rather puzzled by the idea that you have to keep the tilt so stable for intelligent life to develop. I can see it would help, but given all the stuff that Earth-based life survives, I wouldn't be all that surprised to hear of a planet with intelligent life migrating on a massive scale, or hybernating, or just really, really good at coping with temperature swings.
Permalink Thu, 01 Dec 2011 16:54:13 UTC | #894746