Talk:Galaxy groups and clusters

From Wikipedia, the free encyclopedia
Jump to: navigation, search
WikiProject Astronomy / Astronomical objects  (Rated C-class, Top-importance)
WikiProject icon Galaxy groups and clusters is within the scope of WikiProject Astronomy, which collaborates on articles related to Astronomy on Wikipedia.
C-Class article C  This article has been rated as C-Class on the project's quality scale.
 Top  This article has been rated as Top-importance on the project's importance scale.
Taskforce icon
This article is supported by WikiProject Astronomical objects, which collaborates on articles related to astronomical objects.


A list of members for each group and cluster is a good start, but I think it would be more useful to give distances and locations, plus maybe diameters. Anyone have access to that sort of information? My books are all back in Calgary. --Josh Grosse

All this information came from the internet. Article is a work in progress feel free to add information. Very difficult to find complete information for some of these groups. Mathew Carrier


I think there is a better place for the entropy calculation somewhere else. It is not done correctly anyway. Oth (talk) 18:12, 3 March 2008 (UTC)

How does one calculate the number of galaxy groups or clusters? or super-clusters of galaxies? —Preceding unsigned comment added by Quaker phil (talkcontribs) 22:55, 13 October 2009 (UTC) Nominated for speedy Deletion[edit]

Icon Now Commons orange.svg An image used in this article,, has been nominated for speedy deletion at Wikimedia Commons for the following reason: Copyright violations
What should I do?
Speedy deletions at commons tend to take longer than they do on Wikipedia, so there is no rush to respond. If you feel the deletion can be contested then please do so (commons:COM:SPEEDY has further information). Otherwise consider finding a replacement image before deletion occurs.

This notification is provided by a Bot --CommonsNotificationBot (talk) 15:24, 7 July 2011 (UTC)

Proposal to merge Galaxy cluster into this page[edit]

There's really no need to have multiple pages on groups and clusters, as they differ only in size, and there's no sharp physical change. (Historically, clusters could be detected without redshift information, while groups couldn't, but almost all data today uses redshift information for cluster detection anyway.) It makes more sense to me to have a single article covering groups and clusters of all mass ranges. --Infophile (Talk) (Contribs) 19:01, 4 January 2012 (UTC)

Rhetorically speaking... by differing in size do you mean just by mass and not volume, or by both? The point is there are other differences; superheated gas exists in clusters but not in groups, to name one. Any merging of both articles will have to outline their similarities as well as their differences instead of simply copying and pasting both articles together (to whoever decides to do this, if it gets decided on). Here's an excellent starting point: [The Difference Between Clusters and Groups: A Journey from Cluster Cores to Their Outskirts and Beyond]. I'll hopefully be able to contribute, if I find the time. Tom.Reding (talk) 05:39, 14 February 2012 (UTC)

Either these articles should be merged into one, or there should be two separate articles - Galaxy cluster and galaxy group. It's confusing to have one article overlapping another. If a group is substantially different from a cluster, it should have its own article. --George100 (talk) 04:24, 4 June 2012 (UTC)

Galaxy subgroup, Galaxy subcluster[edit]

Galaxy subgroup and Galaxy subcluster redirect here, but aren't explained in the article. -- Beland (talk) 05:11, 13 October 2012 (UTC)