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Planetary nebula
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== External links == {{Commonscat|Planetary nebulae}} * [http://www.daviddarling.info/encyclopedia/P/planneb.html Entry in the Encyclopedia of Astrobiology, Astronomy, and Spaceflight] * [https://chandra.harvard.edu/photo/2001/1220/index.html Press release on recent observations of the Cat's Eye Nebula] * [http://messier.seds.org/planetar.html Planetary Nebulae], SEDS Messier Pages * [http://www.spacedaily.com/news/stellar-chemistry-05a.html The first detection of magnetic fields in the central stars of four planetary nebulae] * [http://www.nightskyinfo.com/planetary_nebulae Planetary Nebulae—Information and amateur observations] * [http://xstructure.inr.ac.ru/x-bin/theme3.py?level=1&index1=38478 Planetary nebula on arxiv.org] {{-}} {{star}} {{nebula}} {{Portal bar|Astronomy|Stars|Outer space}} {{Authority control}} {{DEFAULTSORT:Planetary Nebula}} [[Category:Planetary nebulae| ]] [[Category:Stellar evolution]] [[Category:Articles containing video clips]]
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