by neufer » Sat Aug 29, 2020 6:23 pm
JohnD wrote: ↑Sat Aug 29, 2020 5:44 pm
"Our" own Milky Way, Neufer? Oh, of course, you only vacation at Tralfamodore [sic],
and that's in our very own Magellanic Cloud! 'Our' galaxy, indeed!
- I have dual citizenship for both Titan & Tralfamadore.
https://en.wikipedia.org/wiki/Tralfamadore wrote:
<<In The Sirens of Titan, Tralfamadore is a planet in the Small Magellanic Cloud and the home of a civilization of machines, which dispatches Salo to a distant galaxy with a message for its inhabitants. After a part in his ship breaks, however, Salo is forced to land on Titan, a moon of Saturn, where he befriends Winston Niles Rumfoord. Rumfoord exists in much the same way as the Tralfamadorians of Slaughterhouse-Five, while Salo appears to move in a linear fashion. The translation of Tralfamadore is given by Salo as both all of us and the number 541. The Tralfamadorians were originally developed by super-beings who built them to allow themselves to search for a meaning to their lives. Unable to achieve this task, they eventually asked the machines to do it for them, and upon knowing that they could not be said to have any purpose at all, the precursor race decided to eradicate itself, just to realize that they were not even very good at this, so they used the Tralfamadorians instead to complete the annihilation of their race.>>
JohnD wrote: ↑Sat Aug 29, 2020 5:44 pm
I meant two BHs as cause of a galactic bar, that would, by definition, NOT be at the centre of a galaxy, Chris, but orbiting its centre of mass. Very slowly, as slowly as a galaxy rotates (?). Their interaction would draw matter and stars into that central bar.
Hoyle, Masters, Nichol et al, found that galactic bars were between 3 and 20 kiloparsecs long (10 and 100 ight years), and that of observed galaxies, the higher the red shift (the youngest) the longer the bar. This would correspond with BHs marking the foci of a bar, and their orbits slowly getting smaller with time, presumably due to tidal effects on each other and their surounding matter.
https://academic.oup.com/mnras/article/ ... 27/1749219
As the BHs migrated inwards to eventually merge at the centre, the bar would get shorter, but may remain for some time , after the central cataclysm.
It would be highly improbable for two black holes to be quasi-stable orbiting Doppelgängers of each other
(much less to be playing "ping-pong" with each other with all of those "bar stars").
https://en.wikipedia.org/wiki/Doppelg%C3%A4nger_(1969_film) wrote:
<<Doppelgänger is a 1969 British science-fiction film. Outside Europe, it was released as Journey to the Far Side of the Sun, the title by which it is now more commonly known. Set in 2069, the film concerns a joint European-NASA mission to investigate a newly-discovered planet that lies opposite Earth on the other side of the Sun. The mission ends in disaster and the death of one of the astronauts, after which his colleague comes to believe that the planet is a mirror image of Earth.>>
Spiral structure probably has much more to do with dark matter than with black holes.
[quote=JohnD post_id=305695 time=1598723041 user_id=100329]
"Our" own Milky Way, Neufer? Oh, of course, you only vacation at Tralfamodore [sic],
and that's in our very own Magellanic Cloud! 'Our' galaxy, indeed![/quote]
[list]I have dual citizenship for both Titan & Tralfamadore.[/list]
[quote=https://en.wikipedia.org/wiki/Tralfamadore]
<<In The Sirens of Titan, Tralfamadore is a planet in the Small Magellanic Cloud and the home of a civilization of machines, which dispatches Salo to a distant galaxy with a message for its inhabitants. After a part in his ship breaks, however, Salo is forced to land on Titan, a moon of Saturn, where he befriends Winston Niles Rumfoord. Rumfoord exists in much the same way as the Tralfamadorians of Slaughterhouse-Five, while Salo appears to move in a linear fashion. The translation of Tralfamadore is given by Salo as both all of us and the number 541. The Tralfamadorians were originally developed by super-beings who built them to allow themselves to search for a meaning to their lives. Unable to achieve this task, they eventually asked the machines to do it for them, and upon knowing that they could not be said to have any purpose at all, the precursor race decided to eradicate itself, just to realize that they were not even very good at this, so they used the Tralfamadorians instead to complete the annihilation of their race.>>[/quote]
[quote=JohnD post_id=305695 time=1598723041 user_id=100329]
I meant two BHs as cause of a galactic bar, that would, by definition, NOT be at the centre of a galaxy, Chris, but orbiting its centre of mass. Very slowly, as slowly as a galaxy rotates (?). Their interaction would draw matter and stars into that central bar.
Hoyle, Masters, Nichol et al, found that galactic bars were between 3 and 20 kiloparsecs long (10 and 100 ight years), and that of observed galaxies, the higher the red shift (the youngest) the longer the bar. This would correspond with BHs marking the foci of a bar, and their orbits slowly getting smaller with time, presumably due to tidal effects on each other and their surounding matter. https://academic.oup.com/mnras/article/415/4/3627/1749219
As the BHs migrated inwards to eventually merge at the centre, the bar would get shorter, but may remain for some time , after the central cataclysm.[/quote]
[c]It would be highly improbable for two black holes to be quasi-stable orbiting Doppelgängers of each other
(much less to be playing "ping-pong" with each other with all of those "bar stars").[/c]
[quote=https://en.wikipedia.org/wiki/Doppelg%C3%A4nger_(1969_film)]
<<Doppelgänger is a 1969 British science-fiction film. Outside Europe, it was released as Journey to the Far Side of the Sun, the title by which it is now more commonly known. Set in 2069, the film concerns a joint European-NASA mission to investigate a newly-discovered planet that lies opposite Earth on the other side of the Sun. The mission ends in disaster and the death of one of the astronauts, after which his colleague comes to believe that the planet is a mirror image of Earth.>>[/quote]
[c][b][u][color=#0000FF]Spiral structure probably has much more to do with dark matter than with black holes.[/color][/u][/b][/c]