Talk:Nebula
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[edit] Dark Nebula under Diffuse Nebula
the dark nebula is listed within the category "Diffuse Nebula", even though it says that dark nebulae arent a type of diffuse nebulae —Preceding unsigned comment added by 216.232.237.84 (talk) 02:17, 13 December 2007 (UTC)
[edit] Possible Misinformation
The following material is not accurate, so I put it here until I (or someone else) corrects it and reincorporates it into the main text. AN
Stars emanate gas during novae and supernovae, giving rise to planetary nebulae and supernova remnants, respectively. In a nova, the star sloughs off its outer layers of gas as it collapses into a dwarf, and these clouds are propelled outward by the remaining star's stellar windand glow from the heat of the star. In a supernova, the star collapses violently on itself and explodes with an enormous shock wave which lights up all the interstellar gas in the region, and the remaining neutron star or black hole emits highly charged radiation as it sucks up everything around it, keeping the center of the cloud brightly lit
At this point the star may die or move on, and the cloud may disperse and merge with other clouds. But when the dust is dense enough, gravity will turn the inevitable knots and perturbances into new stars. These new stars may reflect light off the gas, creating a reflection nebula, or excite the gas with their radiation, creating an emission nebula. Many nebulae display both characteristics, and are referred to as diffuse nebulae. In addition, the lit parts of this kind of nebula may be blocked by unlit gas on the nebula's periphery, creating a dark nebula.
--Unknown Editor from an early version of the talkpage
I also removed some rather obvious inaccuracies from the article. Specifically, 66.178.172.98 had made an edit claiming that the Eagle Nebula was now considered a galaxy, which sounds laughably implausible to me. Hope I wasn't out of line, as I am kind of new around here. --Cecilkorik 02:33, 15 May 2007 (UTC)
[edit] Merging Types of Nebulae
I don't know who proposed the merge, but I agree with it. When I first came to the Nebula article, I was actually looking for more information about the different types of nebula. I would never have thought to look under 'Types of Nebula' to find that information. Most other articles seem to provide a fairly comprehensive discussion of types in the main article, only branching off into a separate article if the information becomes extremely detailed, which is not the case here. In any case, there should be at least some discussion of the various types of nebulae in the main article, as currently there is none. Cecilkorik 18:16, 24 May 2007 (UTC)
- This article now needlessly repeats itself now that Types of nebula has been merged. It needs a bit of re-writing. Rip-Saw 12:42, 23 August 2007 (UTC)
[edit] Molten planets
I would like to see an explanation of why the planets were initially in a molten form if they formed from nebulae. 71.102.74.156 (talk) 02:45, 9 December 2007 (UTC)
