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Why are they called Planetary?

William Herschel coined the term in his classification of nebulae in 1784 or 1785.

Ngc-7009
NGC7009 – Saturn Nebula , DSS Image
Discovered by William Herschel in 1782

He discovered Uranus so he should know! Many PN are indeed small, round, and green, just like Uranus!

Next, What Stars form Planetary Nebula?

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