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+--- Thread: Double-earths by Anders Sandberg (/showthread.php?tid=608)
Double-earths by Anders Sandberg - stevebowers - 11-29-2013
Here's a recent article by Anders Sandberg giving some details of planets twice as wide as Earth; note how different the wet and and dry case are.
http://www.aleph.se/andart/archives/2013/11/greetings_from_doubleearth.html