On Sun, Dec 09, 2007 at 10:35:09PM -0800, shadow at shadowgard.com wrote: > Assuming plate tectonics causes stuff to move sunward/antisunward as > well as starward/antistarward, plates moving in from either area are > gonna be weird. You don't want plate tectonics. If the rock is free to flow, you will end up with a black hole instead of a disk. - Tim