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Fraser
2009-Apr-29, 01:20 PM
Here’s another “rogue black hole” theory, which hopefully doesn’t set the doomsday crowd off on a new tangent. But new research suggests that hundreds of massive black holes, left over from the early galaxy-building days of the Universe, may wander the Milky Way. Astrophysicists Ryan O’Leary and Avi Loeb say that rogue black holes [...]

More... (http://www.universetoday.com/2009/04/29/rogue-black-holes-may-wander-the-galaxy/)

GOURDHEAD
2009-Apr-29, 03:23 PM
From the linked article:
Astrophysicists Ryan O’Leary and Avi Loeb say that rogue black holes originally lurked at the centers of tiny, low-mass galaxies. Over billions of years, those dwarf galaxies smashed together to form full-sized galaxies like the Milky Way. But they also predict that Earth should be safe, as the closest rogue black hole should reside thousands of light-years away. This sounds a bit absurd! What guarantees that the gravational interactions between various gravitationally bound objects at the periphery of the MW will not, on rare occassions, be cast into galactic orbits that intersect that of Earth. E.g., Does Arcturus travel in an orbit for which its "plane" intersects the disk of the MW at an appreciable angle to the "central plane" of the MW's disk?

trinitree88
2009-Apr-30, 11:23 PM
From the linked article:This sounds a bit absurd! What guarantees that the gravational interactions between various gravitationally bound objects at the periphery of the MW will not, on rare occassions, be cast into galactic orbits that intersect that of Earth. E.g., Does Arcturus travel in an orbit for which its "plane" intersects the disk of the MW at an appreciable angle to the "central plane" of the MW's disk?

Gourdhead. Agreed. I'll settle for one single definitive black hole, with some matter trailing into it, releasing radiation as it goes through a gas/dust cloud, that excludes without question the same process being done by a large neutron star. Just one.Not hundreds. Been waiting a while for one. pete