Talk:Bullet Cluster

From Wikipedia, the free encyclopedia

	Portal This article is within the scope of WikiProject Astronomy, which collaborates on articles related to astronomy, and WikiProject Astronomical Objects, which collaborates on articles related to astronomical objects.
Start	This article has been rated as start-Class on the assessment scale.
Help with this template This article has been rated but has no comments. If appropriate, please review the article and leave comments here to identify the strengths and weaknesses of the article and what work it will need.

[edit] Merge with Bullet cluster of galaxies

The two articles Bullet cluster and Bullet cluster of galaxies were created within a few hours of each other, and should be merged. The article at Bullet cluster is better developed, so we can basically keep that one. As far as the name, I chose Bullet cluster of galaxies to match the articles at Virgo cluster of galaxies and Coma cluster of galaxies, so I suggest the article be placed at Bullet cluster of galaxies. --Reuben 18:42, 16 August 2006 (UTC)

I merged them here. Everyone please feel free to improve the article but I suggest waiting until NASA's announcement on Monday before dealing with the scientific details (the exact specs - the numbers) of what we know about dark matter due to the bullet cluster. I also suggest waiting until then to decide on the best title for the article. One thing I don't know right now is whether "Bullet Cluster" or "Bullet cluster" is better. WAS 4.250 23:37, 16 August 2006 (UTC)

There's actually quite a lot known about the Bullet cluster now. I expect the upcoming Chandra result will be an incremental improvement on the X-ray gas component; it shouldn't change anything about the DM density and location, inferred from weak lensing. I suggest the style "Bullet cluster of galaxies" for consistency with other cluster articles, such as Virgo cluster of galaxies and Coma cluster of galaxies. --Reuben 01:17, 17 August 2006 (UTC)

The merged version looks great, by the way. Thanks for taking care of that. --Reuben 03:55, 17 August 2006 (UTC)

Thanks. If no one makes an issue of it feel free to move the artice to "Bullet cluster of galaxies" when appropriate. I recommend a week from now as being appropriate. Should "Bullet Cluster" or "Bullet cluster" be used within the article? I don't know. But if "Bullet Cluster" is correct for within the article then "Bullet Cluster of galaxies" is more corrct than "Bullet cluster of galaxies". I think. WAS 4.250 05:51, 17 August 2006 (UTC)

Hmm, actually I tend to agree that "Bullet cluster" sounds better, and I'm used to hearing it always called just the "bullet cluster." Maybe the other cluster articles should be moved? I suppose I could take a look and see if there's been a discussion about galaxy cluster naming. --Reuben 16:50, 17 August 2006 (UTC)

The general rule on naming articles is to use the most common name; to use what someone would type in the search box as their first guess; to use what will most often be used in other articles to refer to it; to use what our sources and the general media call it. The most common exceptions that I'm aware of are the use of technically correct names especially in biology due to accuracy concerns, the use of disambiguation elements in titles, and the use of NPOV elements in titles with strong emotional ties. WAS 4.250 00:05, 18 August 2006 (UTC)

[edit] External links

• CXO: NASA Finds Direct Proof of Dark Matter (NASA Press Release 06-297) August 21, 2006
• CXO: 1E 0657-56: NASA Finds Direct Proof of Dark Matter (
• CXO: Bedeviling Devil's Advocate Cosmology (The Chandra Chronicles) August 21, 2006
• NASA: A Matter of Fact (Charlie Plain) 08.21.06
• NASA: NASA Finds Direct Proof of Dark Matter (NASA Press Release 06-297) Aug. 21, 2006
• ScienceDaily: NASA Finds Direct Proof Of Dark Matter (NASA) August 21, 2006
• This Week's Finds in Mathematical Physics (Week 238) (John Baez) August 16, 2006
• Dark Matter Exists 11:52 am, August 21st, 2006
• arXiv: A direct empirical proof of the existence of dark matter (Marusa Bradac) Sat, 19 Aug 2006 17:51:03 GMT
• arXiv: Strong and weak lensing united III: Measuring the mass distribution of the merging galaxy cluster 1E0657-56 (Marusa Bradac) Fri, 18 Aug 2006 20:06:48 GMT

some links, I'll snip this down to an external links section for the article. Zzzzzzzzzzz 08:07, 22 August 2006 (UTC)

[edit] Question

Does KATRIN have the ability to completely rule out MOND by proving neutrinios are not massive?--Deglr6328 00:09, 19 November 2006 (UTC)

It took a few months, but I saw this question. The sum of neutrino masses is constrained to be about .66eV, over a factor of 3 smaller than what MOND says it requires. I'd like to include this, but I suck at editing so I'd like some pointers.

http://lambda.gsfc.nasa.gov/product/map/dr2/pub_papers/threeyear/parameters/wmap_3yr_param.pdf

--Jowr 09:53, 1 March 2007 (UTC)

I've opened a discussion about this at WikiProject Physics. Anville 17:49, 10 April 2007 (UTC)