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Author Topic: Re: Why are there black holes at the centres of galaxies?  (Read 1354 times)

Offline acsinuk

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All this speculation about invisible matter inside black holes can be eliminated if only cosmologists would accept that there is a magnetic force field at the centre of each galaxy around which all the stars are attracted to rotate.  If that force were about 20 times as strong as gravity then I think the problem is forever solved. 
BTW in my opinoin it is the black holes repelling each other that is causing the universe to expand.
Happy New Year
CliveS


 

Offline syhprum

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Re: Re: Why are there black holes at the centres of galaxies?
« Reply #1 on: 06/01/2013 21:32:47 »
should this not be banished to "new theories"
 

Offline evan_au

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Re: Re: Why are there black holes at the centres of galaxies?
« Reply #2 on: 07/01/2013 10:31:27 »
The Voyager spacecraft appear to be reaching a zone where the magnetic field of the Sun is interacting with interstellar magnetic fields (and similar for the solar wind interacting with interstellar gas). Astronomers are watching this interaction with great interest. Perhaps there is a weak galactic magnetic field, but the Voyagers' measurements will be too localised near the Sun to tell if there is an overall galactic magnetic field.

For a galactic magnetic field to bend the orbits of stars, it would need to be so strong that we would not need to send out the Voyager spacecraft to detect it! We would be able to detect it on Earth...

But there is a bigger problem: The Sun's magnetic field reverses about every 11 years, so if there were a galactic magnetic field, the Sun will be alternatively attracted and repelled by it. This will not result in the attractive-only force which is required to keep stars in roughly circular orbits around the galactic nucleus.

As far as we know, gravity is attractive-only, so Gravity fits these observed orbits much better than a magnetic field.

Because Gravity only attracts, interactions of black holes will only act to slow down the expansion of the universe, not to power the expansion.

Footnotes:
1) We can now peer very close into the center of our galaxy, and the results appear consistent with a Black Hole, hinting at relativistic effects that you would not see with a magnetic field. http://news.bbc.co.uk/2/hi/science/nature/7774287.stm
2) The presence or not of a black hole at the center of our galaxy is not very relevant to the orbit of the Sun - if the black hole makes up 0.1% of the mass of the galactic bulge, sudden disappearance of this black hole would not make a big difference to the Sun's orbital period (but it might disrupt the galactic bulge slightly).
 

Offline acsinuk

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Re: Re: Why are there black holes at the centres of galaxies?
« Reply #3 on: 12/01/2013 12:58:41 »
Well, there was a reply that disappeared.  All of us are waiting for voyager to leave the solar system but if the neighbouring star is 4 lightyears away then we will be in for a long 2 year  wait. Predictably, once voyager gets out of solar space and into the next stars magnetic space we will loose contact. 
The apparent reversal of the suns magnetic field every 11 years is very much influenced by the position of the gas giants Jupiter and Saturn.  The magnetic linking of the sun to these planets is so strong that it may sometimes even reverse our planet earths magnetic field as well! 
The linking of our sun to the milky way galactic magnetic hub [super massive black hole] in my opinion cannot reverse. It is inconceivable that the induced magnetic hub is not there as all stars in the milky way are linked in and spun by it.  If it disappeared then the stars would fly out and crash
CliveS 
 

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Re: Re: Why are there black holes at the centres of galaxies?
« Reply #3 on: 12/01/2013 12:58:41 »

 

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