Similarly, my quick calculation, given an escape velocity high enough to walk and an object 10 meters in diameter, was about 7 * 10^9. That’s roughly the density of electron-degenerate matter; I’m pretty sure nothing will hold together at that density without substantial outside pressure, and since we’re excluding gravitational compression here I don’t think that’s likely.
Keeping a shell positioned would be easy; just put an electric charge on both it and the black hole. Spinning the shell fast enough might be awkward from an engineering standpoint, though.
Keeping a shell positioned would be easy; just put an electric charge on both it and the black hole.
This won’t work for spherical shells and uniformly distributed charge for the same reason that a spherical shell has no net gravitational force on anything inside it. You’ll need active counterbalancing.
Similarly, my quick calculation, given an escape velocity high enough to walk and an object 10 meters in diameter, was about 7 * 10^9. That’s roughly the density of electron-degenerate matter; I’m pretty sure nothing will hold together at that density without substantial outside pressure, and since we’re excluding gravitational compression here I don’t think that’s likely.
Keeping a shell positioned would be easy; just put an electric charge on both it and the black hole. Spinning the shell fast enough might be awkward from an engineering standpoint, though.
This won’t work for spherical shells and uniformly distributed charge for the same reason that a spherical shell has no net gravitational force on anything inside it. You’ll need active counterbalancing.
Ah, true, I didn’t think of that, or rather didn’t think to generalize the gravitational case.
Amusingly, that makes a nice demonstration of the topic of the post, thus bringing us full circle.