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Planetary nebula

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What is a Planetary Nebula?

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What is a Planetary Nebula?

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How Is a Planetary Nebula Formed? : Astronomy Lessons

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Zooming in on the planetary nebula NGC 2899

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Zooming in on the planetary nebula ESO 378-1

A planetary nebula, abbreviated as PN or plural PNe, is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives.
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