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| This is the talk page for discussing improvements to the Galaxy article. This is not a forum for general discussion of the article's subject. |
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"Shell galaxies"
There is another theory as to the formation of these. It involves (relatively) sudden and short-lived influxes of matter into galaxies' central black holes, creating "flashes"of light and other energy that travel outwards as spheres, appearing, of course as circles. There are still some issues with this explanation, which is why I've put this comment here, rather than into the body of the article.
upload also: galaxy - A4 dimensions - artist's impression
Andromeda galaxy contrasted and recolored (some few afar stars are montaged)
The mystery of galaxy Q 6188 in Cetus
I don't know if I'm at the right place to ask questions about the mysterious galaxy Q 6188 in Cetus (??). It is the only galaxy in Uranometria 2000.0 (1987 edition) which is catalogued as "Q" (see charts 261 / 262). Could this be an error? That's the conclusion of Wolfgang Steinicke of the book -Galaxies and How to Observe Them-. According to Steinicke, this galaxy is also catalogued as Mrk 960 and PGC 2845. The coordinates of this galaxy are (J2000.0) R.A. 00:48.6 / Decl. -12°44'. Danny Caes, Ghent-Belgium. 2A02:1812:151F:5500:6DB0:E10C:2CAE:9FF2 (talk) 10:29, 22 April 2019 (UTC)
Possibly All Galaxies Have A Supermassive Black Hole At Their Heart
The current hypothesis is that every galaxy has a supermassive black hole at its heart and that a galaxy can't form without its SBH. 73.85.203.93 (talk) 15:15, 16 January 2020 (UTC)
- Do you have a specific edit you want to make to the article? Because this topic is already discussed here. - Parejkoj (talk) 18:20, 16 January 2020 (UTC)
- Yes... The current hypothesis by the majority of cosmologists is that every galaxy has a supermassive black hole at its heart and that a galaxy can't form without its SBH. 73.85.203.93 (talk) 19:47, 16 January 2020 (UTC)
- This isn't accurate. We have discovered galaxies without supermassive black holes in their centers. See, for example, A2261-BCG. –Prototime (talk · contribs) 18:31, 11 July 2020 (UTC)
- It is correct but perhaps needs to be more clear. As it has to do with formation...not about the fact they can survive without one after formation. To quote the NASA source at A2261-BCG.."Astronomers have proposed two possibilities for the puffy core. One scenario is that a pair of merging black holes gravitationally stirred up and scattered the stars. Another idea is that the merging black holes were ejected from the core. Left without an anchor, the stars began spreading out even more, creating the puffy-looking core.".--Moxy 🍁 03:08, 12 July 2020 (UTC)
- That isn't necessarily correct either. M33 doesn't have a supermassive black hole in its center, and some scientists conclude that it likely never did, as XOR'easter has pointed out elsewhere. –Prototime (talk · contribs) 07:41, 12 July 2020 (UTC)
Estimate of number of galaxies revised?
"the unseen galaxies are less plentiful than some theoretical studies suggested, numbering only in the hundreds of billions rather than the previously reported two trillion galaxies." https://hubblesite.org/contents/news-releases/2021/news-2021-01 ChaTo (talk) 12:54, 14 January 2021 (UTC)
Featured article concerns
There is a decent amount of uncited text in this article, and most of the sources are from before 2010, suggesting that newer discoveries or theories may not be well-represented. I have concerns that this article meets the featured article criteria, and it may require a featured article review. Hog Farm Talk 19:21, 22 February 2021 (UTC)
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