Starship Asterisk*

[hide][attachment=0]Closer Than Virgo 4.jpg[/attachment][attachment=1]Closer Than Virgo 5.jpg[/attachment][/hide]
[imghover=https://asterisk.apod.com/download/file.php?id=47677&mode=view]https://asterisk.apod.com/download/file.php?id=47678&mode=view[/imghover]

So here is M94, in the middle* of the road to Virgo cluster and M87, and here is M101, jumping a little up to Local Void from where the 3d app is looking:
[hide][attachment=1]Closer Than Virgo.jpg[/attachment][attachment=2]Closer Than Virgo 2.jpg[/attachment][/hide]
[imghover=https://asterisk.apod.com/download/file.php?id=47661&mode=view]https://asterisk.apod.com/download/file.php?id=47662&mode=view[/imghover]

in fact it is M96/Leo in [i]the middle[/i] of that road. M94 is one third of that road

[attachment=0]Closer Than Virgo 3.jpg[/attachment]

[url]http://www.galaxies3d.org/section-download.htm[/url]
I am thick but finally got it, there [i]is[/i] a 3d space map freeware
[hide][attachment=0]Ursa Major Big Dipper.jpg[/attachment][attachment=1]Ursa Major Big Dipper 2.jpg[/attachment]
[/hide][imghover=https://asterisk.apod.com/download/file.php?id=47659]https://asterisk.apod.com/download/file.php?id=47660[/imghover]

[hide][attachment=0]07-Laniakea_(LofE07240) 10.jpg[/attachment][attachment=1]07-Laniakea_(LofE07240) 11.jpg[/attachment][/hide]
[imghover=https://asterisk.apod.com/download/file.php?id=47645]https://asterisk.apod.com/download/file.php?id=47646[/imghover]

[hide][attachment=0]Galaxy Groups Closer Than the Virgo Cluster (720p_25fps_H264-192kbit_AAC).mp4_snapshot_00.58_[2023.06.12_14.53.15].jpg[/attachment][attachment=1]Galaxy Groups Closer Than the Virgo Cluster (720p_25fps_H264-192kbit_AAC).mp4_snapshot_00.56_[2023.06.12_15.14.15].jpg[/attachment][/hide]
[imghover=https://asterisk.apod.com/download/file.php?id=47641]https://asterisk.apod.com/download/file.php?id=47642[/imghover]

And here I hang the flat view of the CoG over a frame:

where is M94? where is M101?
Pretty close. M94 is in fact in the Council of Giants gathered around Milky Way and Andromeda while M101 is right next to the CoG.
I finally [url=https://www.youtube.com/watch?v=jOFAnKkkq88]found something like a 3d map[/url]. Sadly it's only a video, not an online interactive 3d model, but you can slide the slider and find a clear view of the things.

Here is the flat view of the CoG on wiki:
[img]https://upload.wikimedia.org/wikipedia/commons/thumb/5/5b/LocalSheet.jpg/305px-LocalSheet.jpg[/img]
Here is a pair of frames from the video:
[hide][attachment=0]Galaxy Groups Closer Than the Virgo Cluster (720p_25fps_H264-192kbit_AAC).mp4_snapshot_00.07_[2023.06.12_15.10.11].jpg[/attachment][attachment=1]Galaxy Groups Closer Than the Virgo Cluster (720p_25fps_H264-192kbit_AAC).mp4_snapshot_00.08_[2023.06.12_15.13.22].jpg[/attachment][/hide]
[imghover=https://asterisk.apod.com/download/file.php?id=47638]https://asterisk.apod.com/download/file.php?id=47639[/imghover]

[quote=VictorBorun post_id=331581 time=1686191204 user_id=145500]
[quote=johnnydeep post_id=331572 time=1686171978 user_id=132061]
Why does the text describe the outer ring as "not closed"? It looks pretty closed to me in this image. Unless they're talking about the apparent bridge of stars/gas at 3 o'clock between it and the inner, more colorful area? [ And honestly, I really see only ONE ring here, the outer one, plus an inner much more complex more typical spiral-galaxy structure. ]
[/quote]

My eye sees the difference between 3 o'clock zero gap and 9 o'clock tiny gap as a perspective effect.
Give the outer ring a full doughnut shape and you can see it too
[/quote]

Yes, I do see some structural "stuff" going on at both 3 and 9 o'clock.

[quote=VictorBorun post_id=331576 time=1686179973 user_id=145500]
[quote=johnnydeep post_id=331572 time=1686171978 user_id=132061]
Why does the text describe the outer ring as "not closed"? It looks pretty closed to me in this image. Unless they're talking about the apparent bridge of stars/gas at 3 o'clock between it and the inner, more colorful area? [ And honestly, I really see only ONE ring here, the outer one, plus an inner much more complex more typical spiral-galaxy structure. ]
[/quote]
other astropics see the outer ring as consisting of arcs of uneven brightness
[hide]M94..jpgM94-.jpg[/hide]
[imghover=https://asterisk.apod.com/download/file.php?id=47613&mode=view]https://asterisk.apod.com/download/file.php?id=47612&mode=view[/imghover]
[/quote]

Yes, that image displays a "not closed" structure much more convincingly.

[attachment=0]M94_Brennan_960.jpg[/attachment]
At first I thought it was the result of a galactic merger; but after
reading the APOD; I guess not! :D 8-)

[quote=johnnydeep post_id=331572 time=1686171978 user_id=132061]
Why does the text describe the outer ring as "not closed"? It looks pretty closed to me in this image. Unless they're talking about the apparent bridge of stars/gas at 3 o'clock between it and the inner, more colorful area? [ And honestly, I really see only ONE ring here, the outer one, plus an inner much more complex more typical spiral-galaxy structure. ]
[/quote]

My eye sees the difference between 3 o'clock zero gap and 9 o'clock tiny gap as a perspective effect.
Give the outer ring a full doughnut shape and you can see it too

[url=https://www.cosmotography.com/images/small_new_m94.html]IR+UV[/url] don't see rings at all

So the outer doughnut is a treat that is hard to bring out.
Does this shape mimic a stellar system's Koiper's belt?
Does this shape reflect a thickening in dark matter halo?
Why is at angle to inner disk?

[quote=johnnydeep post_id=331572 time=1686171978 user_id=132061]
Why does the text describe the outer ring as "not closed"? It looks pretty closed to me in this image. Unless they're talking about the apparent bridge of stars/gas at 3 o'clock between it and the inner, more colorful area? [ And honestly, I really see only ONE ring here, the outer one, plus an inner much more complex more typical spiral-galaxy structure. ]
[/quote]
other astropics see the outer ring as consisting of arcs of uneven brightness
[hide][attachment=0]M94..jpg[/attachment][attachment=1]M94-.jpg[/attachment][/hide]
[imghover=https://asterisk.apod.com/download/file.php?id=47613&mode=view]https://asterisk.apod.com/download/file.php?id=47612&mode=view[/imghover]

Why does the text describe the outer ring as "not closed"? It looks pretty closed to me in this image. Unless they're talking about the apparent bridge of stars/gas at 3 o'clock between it and the inner, more colorful area? [ And honestly, I really see only ONE ring here, the outer one, plus an inner much more complex more typical spiral-galaxy structure. ]

[float=left][img3="M94: A Double Ring Galaxy.
Image Credit & Copyright: Brian Brennan"]https://apod.nasa.gov/apod/image/2306/M94_Brennan_1565.jpg[/img3][/float][float=right][attachment=0]APOD 7 June 2023 M94 annotated.png[/attachment][/float]
[clear][/clear]


To me M94 looks more like a triple ring galaxy! :D

Anyway, it is interesting that someone has just brought up Hoag's Object, possibly because Biran Brennan's picture of M94 is somewhat reminiscent of Hoag's Object.


[img3="Hoag's Object: A Nearly Perfect Ring Galaxy
Image Credit: NASA, ESA, Hubble; Processing: Benoit Blanco"]https://apod.nasa.gov/apod/image/1911/Hoag_HubbleBlanco_1080.jpg[/img3]


Fascinating!

Ann

[url=https://apod.nasa.gov/apod/ap230607.html] [img]https://apod.nasa.gov/apod/calendar/S_230607.jpg[/img] [size=150]M94: A Double Ring Galaxy[/size][/url]

[b] Explanation: [/b] Most galaxies don't have any rings of stars and gas -- why does [url=http://en.wikipedia.org/wiki/Messier_94]M94[/url] have two? First, [url=https://apod.nasa.gov/apod/spiral_galaxies.html]spiral galaxy[/url] M94 has an inner ring of newly formed stars surrounding its nucleus, giving it not only an [url=https://www.rover.com/blog/wp-content/uploads/2017/02/pug-2648774_1920-960x540.jpg]unusual appearance[/url] but also a strong interior glow. A [url=https://ui.adsabs.harvard.edu/abs/2001AJ....121.1395W/abstract]leading origin hypothesis[/url] holds that an elongated [url=http://en.wikipedia.org/wiki/Knot_%28mathematics%29#/media/File:Knot_table.svg]knot[/url] of stars known as a [url=https://apod.nasa.gov/apod/ap221016.html]bar[/url] rotates in [url=https://apod.nasa.gov/apod/ap100114.html]M94[/url] and has generated a burst of [url=https://universe.nasa.gov/stars/basics/]star[/url] formation in this inner ring. [url=https://ui.adsabs.harvard.edu/abs/2009ApJ...704..618T/abstract]Observations[/url] have also revealed another ring, an outer ring, one that is more faint, different in color, not closed, and relatively complex. What caused this outer ring is currently unknown. M94, [url=https://www.instagram.com/p/CscKadTpICu/]pictured here[/url], spans about 45,000 [url=http://starchild.gsfc.nasa.gov/docs/StarChild/questions/question19.html]light years[/url] in total, lies about 15 million light years away, and can be seen with a [url=https://apod.nasa.gov/apod/ap011014.html]small telescope[/url] toward the [url=https://spaceplace.nasa.gov/constellations/en/]constellation[/url] of the Hunting Dogs ([url=https://en.wikipedia.org/wiki/Canes_Venatici]Canes Venatici[/url]).


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