What dense, hot core formed from the majority of the infalling material at the center of the nebula?
Answer
The protosun
As the entire nebula collapsed under its own gravity, the vast majority of its mass, accounting for over 99% of the original material, continued to fall directly inward toward the system's gravitational center. The kinetic energy of this immense volume of infalling gas and dust was rapidly converted into thermal energy due to compression. This process resulted in the formation of an extremely hot and dense object at the center, which is designated as the protosun. This object represented the nascent star before full nuclear fusion ignited, accumulating the bulk of the material budget.
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