Retrieving "Main Sequence Progenitor" from the archives

Cross-reference notes under review

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1. White Dwarf

   Linked via "main-sequence progenitor"

   The preceding evolutionary stage involves the Red Giant phase, where core hydrogen fusion ceases, forcing the star/) to expand dramatically as shell hydrogen burning commences. For solar-mass stars, core helium ignition occurs via the Helium Flash. Once helium is exhausted, the star/) sheds its outer envelope, often forming a [Planetary Nebula](/entries/pl…