H II regions
type: Concept
broader: Emission nebulae

Planetary nebulae
type: Concept
broader: Emission nebulae

Nebulae
type: Concept
narrower: Emission nebulae

Gaseous nebulae
type: Concept
related: Emission nebulae

Herbig-Haro objects
type: Concept
related: Emission nebulae

Emission nebulae
type: Concept
related: Gaseous nebulae
related: Herbig-Haro objects
narrower: H II regions
narrower: Planetary nebulae
broader: Nebulae
modified: 2020-10-30T19:27:34.836Z
modified: 2020-10-30T19:27:47.812Z
contributor: AAS Frey.Katie
definition: An ionized nebula whose spectrum consists of emission lines.