Talk:Star cluster

message: This article discusses "super star clusters" but not superclusters. (E.g. the Sirius supercluster.) It is unclear to me whether these are different terms for the same formation or completely separate entities. But both terms are used in the scientific literature.—RJH (talk) 16:22, 4 March 2010 (UTC)
thread_title:  Supercluster 

message: Star cloud redirects here but the article says nothing about star clouds (e.g. M24) which is clearly distinct from both open clusters and gobular clusters. Stub Mandrel (talk) 15:54, 27 September 2019 (UTC)
replies: text: Good work spotting this. BernardoSulzbach (talk) 15:57, 29 September 2019 (UTC)
thread_title:  Star Cloud 

message: What is the difference between a star cluster and a galaxy? Age, or number of stars, or presence of a central black hole, or ...? Norman21 (talk) 17:19, 4 November 2017 (UTC)
thread_title:  Star cluster vs galaxy 

message: According to a very interesting online gazetteer of 10978 star clusters and telescopic asterisms, there should be some sort of cluster near our galaxy's centre called The Brick. The coordinates of this cluster are: 17h 46m 10s / -28° 42' 42" (J2000). Now, why is it called The Brick? (is it because of its shape, or...??). DannyJ.Caes (talk) 16:09, 22 June 2019 (UTC)
replies: text: This most likely refers to G0.253+0.016 a molecular cloud near the centre of the galaxy.  A recent paper.  Lithopsian (talk) 20:31, 23 June 2019 (UTC)
thread_title:  A star cluster called ''The Brick'' 

message: To Lithopsian, thank you for your efforts on the article. The section on Star Clouds is so paltry and unsourced, I hope something can be done about that.  Anyway, in one edit you comment "Cygnus Star Cloud gives the game away, they might just be line-of-sight".  Not sure what you meant by that. My understanding is, the star clouds are large portions of the Milky Way which appear bright because many more stars shine through, not blocked by intervening dust. Assambrew (talk) 08:55, 17 September 2020 (UTC)
replies: text: Star clouds are not clusters.  The stars involved may or may not be close together, but almost certainly they are not gravitationally-bound groupings.  For example, most of the star clouds along the Milky Way show as dense fields of stars simply because we are looking along the disk of the galaxy, not because there is any unusually dense grouping of stars in that direction.  Anyway, most of all the section needs some sources, or it is likely to be deleted completely.  Possibly it needs to be in a different article since the features are not star clusters as such, but probably it isn't notable enough for its own page and I don't have any good ideas where it might fit.  A quick search of Google books doesn't bring a whole lot of definitions, but this might be useful.  There is also an old mention that star clouds are *slightly* more dense than an average chunk of space, but that may not be meaningful given the huge variation.  Lithopsian (talk) 14:14, 17 September 2020 (UTC)
replies: text: Right, star clouds are not clusters so maybe they do deserve a separate article. From an observational standpoint, they are certainly notable as the brightest portions of the Milky Way. Yes that book looks useful, and maybe some of the sources for M24. Strikes me odd that M24 gets billing as the "Sagittarius Star Cloud" instead of the much larger naked-eye cloud. Maybe the large cloud should have its own article. Assambrew (talk) 17:57, 17 September 2020 (UTC)
replies: text: For now, I added more info and a couple of references, maybe later will make separate article. Currently working on new article for the Large Sagittarius Star Cloud. Assambrew (talk) 00:45, 18 September 2020 (UTC)

text: Decided there's not enough material to warrant a separate article, so let's leave it here. I added caveat lead, "Technically not star clusters..." and an image. Assambrew (talk) 08:09, 29 September 2020 (UTC)
thread_title:  Star clouds