Planetary Nebula

nounverified·updated May 18, 2026

GlossaryL1 — what DictionaryL2 — how used ThesaurusL3 — relations Universaleverything

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

MWE

Classifications

per-axis with provenance

Entity Type

Unknown—authoritativeglossary_import_default_pending_classifier

?unassignedlast reviewed —

Sensitivity

unclassified

Information Class

unclassified

Variants

5 surface forms

plural: Planetary NebulaePlanetary Nebulas
possessive: Planetary Nebula's
pluralpossessive: Planetary Nebulae'sPlanetary Nebulas'

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