Planetary nebulae
type: Concept
contributor: AAS Frey.Katie Admin
modified: 2020-12-16T19:19:28.596Z
broader: Emission nebulae
narrower: Planetary nebulae nuclei

Planetary nebulae nuclei
type: Concept
broader: Planetary nebulae

Emission nebulae
type: Concept
narrower: Planetary nebulae