The Orion Nebula, a famous diffuse nebula.

In astronomy, diffuse nebulae is the general term for illuminated nebulae. The three types of diffuse nebulae are reflection nebulae, emission nebulae and supernova remnants. They are diffuse as opposed to the non-diffuse dark nebulae, i.e. the particles have spread out.

See also

• List of diffuse nebulae

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sc; dark diffuse nebula