Retrieving "Hydrogen Shell Burning" from the archives

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1. Stars

   Linked via "hydrogen shell burning"

   Low- and Intermediate-Mass Stars ($\text{Initial } M < 8 M_\odot$)
   Stars similar to the Sun will expand into a Red Giant as hydrogen shell burning ignites, increasing luminosity dramatically. Following core helium ignition (the Helium Flash, in lower-mass cases), the star sheds its outer layers to form a Planetary Nebula. The remaining core contracts into a White Dwarf. The…