physorg.com— NASA scientists using the Swift satellite have conducted the first complete census of galaxies with active, central black holes, a project that scanned the entire sky several times over a nine-month period.
Oct 6, 2006View in Crawl 4
Black holes have a small area of effect, I can't remember where I read it (wikipedia I think), but black holes have a 33:1 gravity ratio. That is you have a black hole that is 1 mile in diameter, anything that is more than 33 miles from the black hole will not be affected by the intense gravity.
'Dormant' black holes are simply singularities that are sitting quietly not bothering anybody.Now if some gas or dust happens to stumble into its gravitational influence, thats when the fireworks begin. As matter swirls down the event horizon of a black hole, it releases an enormus amount of energy. Hard core radiation: gamma and x-rays- very nasty.
When i first read 'dormant' my first thought was dormant volcanoes - however the use is quite different. A dormant volcano is one which itself is inactive. However a dormant black hole seems to be exactly the same as a normal ones - but without an accretion disk, and the only effect of that on a black hole is its increase in size/mass, I think. Dormant black holes would still be undergoing hawking radiation though.
Um who here thinks they actually found them all (close to us) when these things can often be completely invisible?What about the ones that are moving? (yes black holes can move)What about the super black hole(s) at the center of the galaxy causing the rest of the galaxy to orbit the center?
rompom7Oct 7, 2006
Black holes have a small area of effect, I can't remember where I read it (wikipedia I think), but black holes have a 33:1 gravity ratio. That is you have a black hole that is 1 mile in diameter, anything that is more than 33 miles from the black hole will not be affected by the intense gravity.
Closed AccountOct 7, 2006
'Dormant' black holes are simply singularities that are sitting quietly not bothering anybody.Now if some gas or dust happens to stumble into its gravitational influence, thats when the fireworks begin. As matter swirls down the event horizon of a black hole, it releases an enormus amount of energy. Hard core radiation: gamma and x-rays- very nasty.
zombienixonOct 7, 2006
When i first read 'dormant' my first thought was dormant volcanoes - however the use is quite different. A dormant volcano is one which itself is inactive. However a dormant black hole seems to be exactly the same as a normal ones - but without an accretion disk, and the only effect of that on a black hole is its increase in size/mass, I think. Dormant black holes would still be undergoing hawking radiation though.
Closed AccountOct 7, 2006
Um who here thinks they actually found them all (close to us) when these things can often be completely invisible?What about the ones that are moving? (yes black holes can move)What about the super black hole(s) at the center of the galaxy causing the rest of the galaxy to orbit the center?