What is formed at the center of the accretionary disk as matter continues to accumulate?

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Multiple Choice

What is formed at the center of the accretionary disk as matter continues to accumulate?

Explanation:
During the early stages of star formation, material in an accretion disk spirals inward and piles up at the center, heating and condensing as it grows. This central condensation becomes a protostar, the young Sun in a solar-type system, which can eventually ignite fusion and become a true star. The rest of the disk continues to evolve, with solids clumping into planetesimals and eventually planets, but the central object at this stage is the protostar. A neutron star would come from a different, dramatic process (a supernova), not from continued accretion in a young disk.

During the early stages of star formation, material in an accretion disk spirals inward and piles up at the center, heating and condensing as it grows. This central condensation becomes a protostar, the young Sun in a solar-type system, which can eventually ignite fusion and become a true star. The rest of the disk continues to evolve, with solids clumping into planetesimals and eventually planets, but the central object at this stage is the protostar. A neutron star would come from a different, dramatic process (a supernova), not from continued accretion in a young disk.

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