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→Enllaços externs
== Enllaços externs ==
== Enllaços externs ==
{{Commonscat|Hubble images of nebulae}}
{{Commonscat|Hubble images of nebulae}}
* [https://web.williams.edu/Astronomy/research/PN/nebulae/ Gallery of Planetary Nebula Spectra]
* [https://web.archive.org/web/20100425040548/http://laserstars.org/spectra/Nebulium.html Nebulium]
[[Categoria:Astronomia]]
[[Categoria:Astronomia]]
[[Categoria:Nebuloses planetàries| ]]
[[Categoria:Nebuloses planetàries| ]]
[[Categoria:Plasma espacial]]
[[Categoria:Plasma espacial]]