Quote Originally Posted by kronick
evidence...not proof.
Using Radio telescopes we can probe the center of our own galaxy down to a few AU (an AU is the distance from the Sun to the Earth). From the link I posed above you can see the stars orbiting around an "invisible" object (which you can actually see at other wavelengths) and from these orbits you can measure the mass to be about 3,300,000 solar masses. Any object with a mass this large and in a radius that small must be a black hole. There are no known or theoretical forces to support an object against a density like that.

I was wrong about a black hole having magnetic fields; it's the accretion disk around the BH that has a mag. field. But the problem with using that as a power source is that 99% of the photons it emits are in the UV and above. After all it's at a temp. of 750,000K. This makes it very hazardous to anything near enough. I guess it would make more since to use the accretion disk as a source of power. You can actually see the accretion disks in other Galaxies expressly in AGN's. Quasars are probably the most interesting, because the most luminous ones could use an entire galaxies amount of mass in a few millions of years.

"Energy in our Universe is conserved, there will never be any unlimited power source" Is no contradiction. You even said it yourself.

Quote Originally Posted by kronick
sure you might not be able to use one bh forever...
A long time is a long time not forever.

Quote Originally Posted by kronick
but if ur able to use a bh as a power source, you could prolly make one too.
You could make one, but it's going to be extremely hard. The only natural way to make them is through massive stars and getting neutron stars past the critical density. But when you do that, they release a huge amount of energy (Gamma ray bursts and SN explosions). I wouldn't want to be around them when they do.