How are panatery Nebula formed and when do they die

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Panatery nebulae are formed from the remnants of stars after helium fusion ceases, leading to complex processes such as supernova explosions. These explosions disperse stellar material, creating the nebula's structure, which often resembles a star's core surrounded by dust. The ultimate fate of these nebulae is to evolve into white dwarfs as the remaining core cools and contracts. Understanding the R-process and white dwarf formation is essential for grasping these phenomena. Further research into these topics can provide deeper insights into the lifecycle of stars and their remnants.
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My simple question is how are panatery nebula formed.. Al what i know is that after helium fusion is over, some complex process will occur leading to explosion which leads to the nebula... What are these complex processes...Moreover, it appears just like a core of a star surrounded by some dust... And how to they ultimately end becoming a white dwarf?? Thanks in advance... I need answers urgently
 
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