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Probably the Sun, but most scientists believe that the planets formed pretty quickly after that; the math doesn't seem to allow much time between the Sun igniting and the planets starting to form.

It was probably a fairly chaotic time; the chances are that there were dozens, perhaps HUNDREDS of small planetoids that then merged by repeated collisions. In fact, we're fairly sure that the Earth came to be as it is and the Moon formed when the pre-Earth collided with another smaller planet perhaps as large as Mars. The debris blasted into space then collected in orbit to form the Moon.

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โˆ™ 2011-08-26 02:15:42
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