What analogy describes the internal structure of a massive star during layered fusion?

Answer

An intricate, layered onion

As a massive star exhausts the hydrogen fuel in its core and begins fusing heavier elements, its internal structure transitions from a relatively simple configuration to a highly complex arrangement characterized by nested shells of burning fuel. Each shell fuses a different element, progressing from lighter elements in the outer shells to heavier elements closer to the center, similar to the distinct layers found in an onion. This structure facilitates the fusion of elements sequentially: hydrogen to helium in the core, then helium to carbon upon contraction, followed by carbon to neon, oxygen to silicon, and so forth. This intricate layering supports the star until the iron core forms, highlighting the increasing complexity and pressure required to maintain equilibrium as higher mass elements are generated.

What analogy describes the internal structure of a massive star during layered fusion?

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