Answer:
It got hotter, its rate of rotation increased, and it flattened into a disk.
Explanation:
When an explosion of a star (maybe a supernova) took place, all the energy and dust start to move around and compress. As all the dust and gases got together, as a ballet dances, the moving started to move faster, that is, the rotation increased. when the materials got together to react among them, they got hotter in the center, and colder in the outside part.
This ring got thinner until it forms a flattened disk, forming the planets of the solar system.
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