What is ejected into the interstellar medium from a core-collapse supernova that was synthesized during the star's stable life stages prior to collapse?
Answer
Elements like oxygen, magnesium, and silicon
The ejected material from a core-collapse supernova remnant is a mix: material fused before collapse, such as oxygen, magnesium, and silicon, along with the iron from the core, plus the freshly minted heavy elements from the explosion itself.
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