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Re: Blackholes, Proof Of There Existence?

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Posted by Thed/">Thed on December 16, 1998 11:41:08 UTC

: : Do you any info concerning proof that blackholes exist?

: : any info would be greatly appreciated.

: well, we cant really see them directly, but we : can observe the effect they have on nearby stars; : ie. gravitational lensing, twin star orbit when no : observable matter is there for another star to : orbit around.

Also the existence of jets from Active Galaxies. The standard model says that the jets are a result of the accretion disk around a super-massive Black Hole being acclerated to relativistic fields and then the matter escaping perpendicular to the accretion disk due to the strong magnetic fields in the disk.

You also have a large number of Hubble Space Telescope images now that "proove" balck holes exist. I posted links to those images earlier this year. Search on the main page for "Thed" and see what you get.

: or the effect of having an entire galaxy spin on : an axis that would, mathmatically, require an : enormous mass at its center to keep everything : in 'orbit' around its center.

You don't need a Black Hole to keep a galaxy spinning. The mass of the disk of a spiral galaxy is vastly greater than the mass of any black holes in the center and is all that is required to keep the spiral galaxy spinning.

Elliptical galaxies generally do not "spin" and most probabaly do not have central blsck holes. Ellipticals behave more as a gas cloud does where each member star behaves like the molecules in a gas. Gas pressure and collisions are then all you need to model how the elliptical galaxy behaves.

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