Diffuse nebula

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The Orion Nebula, a famous reflection nebula.
The Orion Nebula, a famous reflection 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.

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