What element builds up in the core of massive stars ($ extgreater 8 M_ ext{Sun}$) until fusion ceases and collapse occurs?

Answer

Iron

For the short-lived, massive stars, the core develops layers of heavier elements until it consists mainly of iron, which cannot release energy through fusion.

What element builds up in the core of massive stars ($	extgreater 8 M_	ext{Sun}$) until fusion ceases and collapse occurs?

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