Instead of the swirling disk of particles slowly coalescing into planets, this would imply that most of the planets formed with a large amount of ice (which is less dense than water) farther out. Repeated impacts would remove the ice from the structure of the planet, increasing its density. The largest, densest proto-planets would be pulled toward the sun, leaving the ice and rubble from their formation behind. I suspect then that wed see dense, rocky planets closer in, followed by large, less-dense gas planets, and then a ring of icy debris on the outer edge. This, of course, is exactly what how our solar system looks.
Posted on: Sat, 16 Nov 2013 02:16:53 +0000
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