Nebula planet: Perbezaan antara semakan
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==Pautan luar==
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* [http://www.daviddarling.info/encyclopedia/P/planneb.html Entry in the Encyclopedia of Astrobiology, Astronomy, and Spaceflight]
* [http://chandra.harvard.edu/photo/cycle1/1220/index.html Press release on recent observations of the Cat's Eye Nebula]
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