What is the meaning of planetary nebula?

noun

  • A nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star. .
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). planetary nebula. Retrieved September 21, 2026, from http://smartdefine.org/planetary_nebula/definitions/1227309
ChicagoWordNet. 2010. "planetary nebula" http://smartdefine.org/planetary_nebula/definitions/1227309 (accessed September 21, 2026).
HarvardWordNet 2010, planetary nebula, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/planetary_nebula/definitions/1227309>.
MLAWordNet. "planetary nebula" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/planetary_nebula/definitions/1227309>