Medium stars
When a sun-like star has used up hydrogen in its core nuclear fusion spreads outside the core making the star expand into a red giant.The core collapses until it is hot and dense enough to fuse helium too.but it runs out of helium too.
finally it turns into a white dwarf and its outer layers spread into space into a space cloud of debris.(Nebula) planets maybe swallowed by the growing red giant.
planetary nebula -- the stars outer layers disperse into space as a glowing cloud of wreckage -- A planetary nebula.The material in this cloud will eventually be recycled to form a new star.
White dwarf -- All that remains is the dying core -- a white dwarf.This earth-sized star will slowly fade and become a cold black dwarf.
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