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← ScienceWhich outcome results when stellar iron fusion ceases within a supergiant star?
A)Core collapse accelerates rapidly✓
B)Helium flash ignites prematurely
C)CNO cycle reactions intensify slightly
D)Star's outer layers stably contract
💡 Explanation
Core collapse accelerates because iron fusion consumes, rather than releases, energy; therefore, the radiation pressure from fusion declines significantly, triggering gravity to overwhelm electron degeneracy pressure, leading to rapid implosion rather than stability or other fusion processes.
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