A Red Giant then becomes unstable and ejects (or sheds) its outer layer of dust and gas as a planetary nebula. This then leaves a hot dense, solid core known as a white dwarf. The white dwarf then cools to become a black dwarf which eventually disappears.
OR
A Red SUPER Giant, however, starts to glow brightly, undergoing more nuclear fusion, expanding and contracting and forming elements no heavier than iron. The red super giant then , forming elements much heavier than iron and ejecting them into the universe to form new planets or stars.
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