On 10/20/2013 12:17 PM, Whitfield Diffie wrote:
You could survive a fall through the event horizon of a quiescent galactic-mass black hole. (Of course you wouldn't survive for long after that, as you approached the singularity. I don't see why. If a black hole is massive enough, (my crude calculation, which those with better ALUs are welcome to correct, is 3.65x10^18 solar masses or about four million times the mass of the Miky Way galaxy) it has about the density of our galaxy as a whole and might be habitable.
It would take many lifetimes to fall from the event horizon to the singularity.
Nor could you avoid the singularity.) Why couldn't you be in orbit inside the event horizon.
You can't be in orbit around the singularity inside the event horizon because the singularity is in your future. It's time-like relative to you, not space-like. You could of course orbit some other body that was also waiting for the singularity to happen.
What this leads to is the question can the universe be distinguished from a black hole?
The universe seems to be expanding faster and doesn't have a singularity in its future. Brent Meeker
Whit
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