How to abbreviate Planetary Nebula?

The ways to abbreviate Planetary Nebula.

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PN:
Planetary Nebula(Celestial object, Celestial objects, Astronomy)
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APASmart Define. (2017). planetary nebula. Retrieved September 23, 2026, from http://smartdefine.org/planetary_nebula/abbreviations/a
ChicagoSmart Define. 2017. "planetary nebula" http://smartdefine.org/planetary_nebula/abbreviations/a (accessed September 23, 2026).
HarvardSmart Define 2017, planetary nebula, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/planetary_nebula/abbreviations/a>.
MLASmart Define. "planetary nebula" 21 December 2017. Web. 23 September 2026. <http://smartdefine.org/planetary_nebula/abbreviations/a>