Why didn't a planet form in the region of the solar system now occupied by the asteroid belt?
A. It was too cold for a rocky planet to form beyond Mars.
B. Orbital resonances with Jupiter disrupted orbits in this region.
C. Gravitational encounters with jovian planets kicked most of this material out into the Oort cloud.
D. There was never enough material to form a planet.
Ans: B. Orbital resonances with Jupiter disrupted orbits in this region.
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