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Nebula
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===Classical types=== Objects named nebulae belong to four major groups. Before their nature was understood, [[galaxy|galaxies]] ("spiral nebulae") and [[star cluster]]s too distant to be resolved as stars were also classified as nebulae, but no longer are. * [[H II region]]s, large diffuse nebulae containing ionized hydrogen * [[Planetary nebula]]e * [[Supernova remnant]]s (e.g., Crab Nebula) * [[Dark nebula]]e Not all cloud-like structures are nebulae; [[Herbig–Haro object]]s are an example.
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