What is the characteristic layered structure observed within a Red Supergiant?

Answer

Hydrogen burning outside, then helium, carbon, neon, oxygen, and silicon leading to an iron core.

The Red Supergiant phase features complex layered fusion, structured like an onion, with hydrogen burning outermost, followed by shells of fusing helium, carbon, neon, oxygen, and silicon, all surrounding the central iron core.

What is the characteristic layered structure observed within a Red Supergiant?
astronomylife cyclestarstellar evolutionmassive stars