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Astronomy

Planetary Nebulae

A planetary nebula [...] is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives. [...] They are relatively short-lived phenomena, lasting perhaps a few tens of millennia, compared to considerably longer phases of stellar evolution. [1]


  1. https://en.wikipedia.org/wiki/Planetary_nebula 9.10.2022[]

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