Linked from
The 15 pages that link to Emission nebula, each with the reason it gives.
Orion NebulaNarrower topic: The Orion Nebula is a prominent example of this kind of luminous cloud.
NebulaBroader topic: This common nebula type shines after nearby energetic stars ionize its gas.
Horsehead NebulaNarrower topic: IC 434 belongs to this class of glowing nebulae.
Hydrogen-alphaRelated: Hydrogen-alpha emission outlines ionized hydrogen in many nebulae.
Lagoon NebulaNarrower topic: The Lagoon Nebula is a prominent example of this glowing nebula type.