| Here is a cartoon of the standard model. |
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|   some of the remaining gas condenses into dust, |
|   dust forms grains of sand, and |
|   grains of sand form rocks. |
|   The rocks collide and stick together to form larger rocks. |
|   Eventually some heaps of rocks get massive enough to gravitationally attract other stuff, |
|   and these growing rock piles form planets. |
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