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Old 12-03-2013, 09:44 AM
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CalMeacham is online now
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[B]Patra-Bannk[/B in Tony Rothman's the World is Round. I don't want to explain it, because that would ruin the story. suffice it to say that the world seems unreasonably big for its density

http://www.amazon.com/THE-WORLD-ROUN.../dp/0345272137


Rocheworld, the setting for several of Robert L. Forward's novels. It consists of two close-together worlds filling the Roche limit with weird and interesting effects (including an intra-planet waterfall

http://en.wikipedia.org/wiki/Rocheworld

Forward's Dragon's egg -- a neutron star with intelligent life on it, the setting for two of his books.

http://en.wikipedia.org/wiki/Dragon's_Egg






I see that I am one of the few who took the OP's request as referring to physically interesting worlds. There are plenty of societally interesting ones.