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Author Topic: Paradox Of A BlackHole Eclipse  (Read 2213 times)

Offline common_sense_seeker

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Paradox Of A BlackHole Eclipse
« on: 28/04/2009 11:50:02 »
Imagine that your spaceship is in a region of space where there are two blackholes which appear to be moving towards one another, so that the nearest one will obscure the blackhole which is further away. Before the 'blackhole eclipse' the spaceship will experience the gravitational attraction of both bodies, but during the eclipse will the gravitational attraction suddenly decrease? This idea is based on the assumption that if a blackhole absorbs everything that enters it, then even the gravitons from the furthest blackhole will be absorbed during it's eclipse.


 

Offline syhprum

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Paradox Of A BlackHole Eclipse
« Reply #1 on: 28/04/2009 12:50:26 »
I think the gist of this question is can a 'blackhole act a gravity shield', I do not think so if gravity is mediated by Gravitons they are extremely light and penetrative and will pass thru a stellar sized blackhole
 

Offline common_sense_seeker

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Paradox Of A BlackHole Eclipse
« Reply #2 on: 28/04/2009 16:40:30 »
I think the gist of this question is can a 'blackhole act a gravity shield', I do not think so if gravity is mediated by Gravitons they are extremely light and penetrative and will pass thru a stellar sized blackhole
There is a research group that would disagree with you though; Blaze Labs Research http://www.blazelabs.com/index.htm.

The idea is that the black hole is of maximum density and therefore will not allow the passing of gravitons
 

Offline Soul Surfer

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Paradox Of A BlackHole Eclipse
« Reply #3 on: 29/04/2009 11:53:08 »
There is absolutely no such thing as a black hole eclipse consider what happens to light if a black hole passed between you and the star.  the star would not disappear it would vary in brightness and get even brighter for a while because the gravity of the black hole(or any other object) bends the light round it and acts a bit like a lens.  a similar thing would happen with gravitons from the gravitational field.  This gravitational lensing effect with light is being used to detect small isolated planet sized bodies at great distances.
 

Offline common_sense_seeker

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Paradox Of A BlackHole Eclipse
« Reply #4 on: 29/04/2009 14:12:39 »
There is absolutely no such thing as a black hole eclipse consider what happens to light if a black hole passed between you and the star.  the star would not disappear it would vary in brightness and get even brighter for a while because the gravity of the black hole(or any other object) bends the light round it and acts a bit like a lens.  a similar thing would happen with gravitons from the gravitational field.  This gravitational lensing effect with light is being used to detect small isolated planet sized bodies at great distances.
Good point, but there IS such a possibility as a blackhole eclipse in theory. There would be gravitational lensing of the gravitons similar to the concept of light, but ths will not nearly compensate for the total obscuration of the furthest blackhole.(just as only some of the light of an eclipsed galaxy will be bent by lensing). There would be a gravity shadow of the furthest blackhole.
« Last Edit: 05/05/2009 15:57:04 by BenV »
 

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Paradox Of A BlackHole Eclipse
« Reply #4 on: 29/04/2009 14:12:39 »

 

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