FACTOID # 14: North Carolina has a larger Native American population than North Dakota, South Dakota and Montana combined.
 
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Encyclopedia > Planetary
  1. Planetary is an adjective meaning relating to a planet or planets.
  2. A planetary nebula is an astronomical object that appears nebulous and disk-like in low-resolution observations. The name is due to a resemblance to planets, not a similarity to them.
  3. Planetary gearing is a gear system also known as epicyclic gearing.
  4. Planetary is a comic book series by Warren Ellis and John Cassaday.

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Planetary Nebulae (1296 words)
On November 13, 1790, Herschel found the planetary nebula NGC 1514 (his H IV.69), which has a very bright central star; thus he became convinced that the planetary nebulae were nebulous material (gas or dust) associated with a central star, and not unresolved clusters as he and others had thought previously.
Planetary nebulae have also been discovered in other galaxies with large telescopes, including the Large and the Small Magellanic Cloud, the Andromeda Galaxy M31, M33, M32, and NGC 6822 as well as other galaxies in the Local Group and beyond.
Planetary Nebulae in the Globular Cluster PAL 6 and NGC 6441.
Planetary nebula - Wikipedia, the free encyclopedia (2478 words)
A planetary nebula is an astronomical object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their lives.
Planetary nebulae are important objects in astronomy because they play a crucial role in the chemical evolution of the galaxy, returning material to the interstellar medium which has been enriched in heavy elements and other products of nucleosynthesis (such as carbon, nitrogen, oxygen and calcium).
Planetary nebulae are generally faint objects, and none are visible to the naked eye.
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