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How did the asteroid belt form?
Answer 1:

We're not sure. It might have been from the collision of two or more planets. Or the asteroids there might have just collected from dust in the early solar system, and never gotten big enough to form planets. One curious thing is, if you draw all the orbits of all the planets in the solar system, it looks like there's a planet missing. The orbit of the "missing planet" happens to be where the asteroid belt is. So a lot of people believe there was once a planet there, but it was smashed up into rocks (asteroids).


Answer 2:

I don't think anybody knows. The dynamics by which planets and planetoid bodies like asteroids form and wind up in the positions that they do are obscure.There are theories out there that "explain" how our solar system came to be laid out the way that it is,but with the discovery of other solar systems with very different arrangements of planets and their orbits, I think it is safe to say that we really have no idea how all of it came to be in our solar system.I think I can say that we are *not* typical in the universe, if there even is a "typical".



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