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WikiProject Astronomy / Astronomical objects  (Rated B-class, Top-importance)
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Listing types[edit]

Moving the list here.

Thanks, Marasama (talk) 23:11, 23 August 2009 (UTC)

(I made it multicolumn for the sake of overview ... said: Rursus (mbork³) 10:47, 27 August 2009 (UTC))
Cool, thanks, Marasama (talk) 20:45, 29 August 2009 (UTC)

Just adding reference to prepare[edit]

Basic info. on nebula. Not the detail items.

Still trying to find the history on it and the first nebula discovered. Thanks, Marasama (talk) 18:00, 20 October 2009 (UTC)

History to-do list[edit]

This is just a working list of information that could be added to the History section:

  • The General Catalogue of Nebulae and Clusters of John Herschel, which later became the NGC. John Herschel postulated that that there was sparse matter throughout space that did not glow.
  • Lord Rosse discovers that many of the nebulae have a spiral structure. He and John Herschel were at odds over the nature of nebulae, with Rosse believing they were unresolved clusters of stars. (The contention was related to the theory of evolution, with Rosse not believing that new stars were still forming.)
  • In 1900, Cornelius Easton argued that the Milky Way had a spiral structure and that many of the nebulae formed part of this structure.[1] (This had first been suggested in the middle of the 19th century.)[2]
  • The observations of E. E. Barnard lent weight to the idea that the dark regions of the sky were actually obscuring matter (rather than tunnel-like holes suggested by John Herschel).[3][4]
  • The 1920 Shapley–Curtis Debate that would lead to the categorization of many nebulae as Island Universes (or galaxies) per Edwin Hubble.
  • Max Wolf was the first person to estimate the distance to interstellar clouds. His approximation compared the number of stars per square degree (and their magnitudes) in a cloud region to elsewhere.
  • In 1927, Herman Zanstra determined how the neutral hydrogen in H II regions became excited.
  • The 1927 explanation by Ira Sprague Bowen of the forbidden lines in the O III spectrum within nebula. (Previously attributed to "nebulium".)
  • The 1953 suggestion of Iosif Shklovsky that the continuum radiation from the Crab Nebula is actually synchrotron radiation.

If you can add some of these in to the article, it would be appreciated. Thanks.—RJH (talk) 19:38, 1 November 2009 (UTC)

Question on other types of Nebulae and/or Clouds[edit]

What the difference between Nebula and Molecular cloud?
Also there are types of Nebulae/Clouds. Talk:Nebula#Listing_types Thanks, Marasama (talk) 15:53, 28 December 2011 (UTC)

Never mind, I found it. Thanks, Marasama (talk) 18:12, 4 May 2012 (UTC)

Why does a reference link to another Wikipedia article?[edit]

I don't think this is allowed... I didn't want to delete the reference, so I'm posting this. Bladeor (talk) 20:04, 31 March 2014 (UTC)