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Measuring a black hole

Author: Sentinel (24.156.105.---) Date:   09-15-02 14:17 Can you measure the size of a hole? Yes. Even though a hole does not exist, you can measure it. It has no physical substance yet you can give it scalar values to describe it. Well, why can't we measure a BH? The truth is, we can. We measure it like it was a hole. Everything we can't see belongs to the black hole. If you look at a point in space and see a heavy collection of stars with a pure black hole in the center, you can be pretty sure it's a BH. The size of the circle you cannot see is called the event horizon, or also Schwartzchild radius. This radius is determined by the mass of the BH. Whether the BH matter clump has measurable dimensions(singularity or not), we can measure it's mass. That is it, other than the mass and schwartzchild radius, we can't get much info from a black hole. Essentially, all relevant information regarding state is lost within a BH. BTW, BH's can theoretically only emit one type of substance. Half of a particle anti-particle pair. One of the two zooms off into free-space while the other gets sucked in as a result of the difference in velocities for the pair. Any kind of x-ray or light emissions do not come from the BH itself. Rather, these radiations are a manifestation of the increased energy acquired by an object being sucked into a BH. As matter falls in, it emits x-rays and so forth before it has passed the event horizon. Also, if a BH is secluded from any matter, it will shrink in time. That is to say, a BH has a temperature and does emit particles and anti-particles. Although, for any BH formed by the collapse of a massive star will not evaporate in the visible lifetime of the universe. The smaller the BH, the hotter it is and the more it radiates. A BH about to release the last of it's matter will probably be easily visible as an intense flash of light and radiation.

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Topics	Author	Date
How large is a black whole ?  new	Chris Della Fave	02-06-02 15:41
Re: How large is a black whole ?	Katie Rosenthal	02-07-02 10:48
Re: How large is a black whole ?  new	david	03-26-02 10:13
Re: How large is a black whole ?	Chattan	06-21-02 17:49
Re: How large is a black whole ?  new	Vegeta	08-08-02 23:37
Measuring a black hole	Sentinel	09-15-02 14:17
Re: How large is a black whole ?  new	Alfonso Espada	08-16-02 22:24
about this big ----------> .  new	Sentinel	08-22-02 19:14
Chris - these two summed it up beautifully!  new	Caspar Marley	08-24-02 00:08
Re: Come on Caspar  new	Chattan	09-07-02 12:23
BHs, tori, Orion, and MIT.  new	Caspar Marley	09-07-02 21:37
Re: Contradiction.	Chattan	09-13-02 11:15
Our sun IS a star  new	Caspar Marley	09-13-02 11:57
Re: Sun  new	Chattan	09-27-02 16:44
Re:  new	Caspar Marley	09-30-02 03:06
Re: Creation.  new	Chattan	10-06-02 14:22
Re: Creation.  new	alyzerine	07-02-03 19:14
Re: cyclic creation  new	Baldev Singh Rana	08-23-03 00:43
Re: Creation.	Garonius maximus	12-10-04 08:34
Re: Creation.  new	Virtual Maria	12-16-04 02:59
Re:  new	Garonius maximus	12-16-04 10:39
Re: Creation.	William Penrod	12-19-04 15:35
Re: Creation.  new	Garonius maximus	12-19-04 17:48
Re: Creation.  new	Garonius maximus	12-19-04 19:36
Re: Creation.  new	William Penrod	12-21-04 12:31
Re: Creation.	Garonius maximus	12-21-04 19:27
Re: Creation.	Garonius maximus	12-22-04 16:19
Re: How large is a black whole ?  new	Steve Heidenreich	11-22-02 02:08
Re:  new	Ray Whitbread	04-15-03 12:50
Re:  new	Garonius maximus	12-11-04 06:27
Re: How large is a black whole ?  new	dont worry	01-11-05 15:18

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