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Planetary nebula is a misnomer because it's a nebula but it has nothing to do with planets, it's about stars.
The Cats's Eye Nebula is a perfect example of a planetary nebula.
See related link for a pictorial.
A star like our sun will shed a planetary nebula after its 'death'
a nebula is classified by a planetary nebulae
Planetary nebula is a misnomer because it's totally irrelevant to planets and it has something to do with stars. The short form is "nebula".