Art sometimes presents strangely.
Is our eternally existent, finite, occupied space Universe strange?
Are there strange phenomena within Universe?
Are there strange phenomena in the oceans on Earth?
Are the strange behaviors of physics?
Are their strangers in a strange land on Earth?
Is it strange that Roy Kerr { rotational black hole fame } says there are two event horizons of a black hole, when I and most others had never heard of two event horizons? Yes it is strange. Does it follow logical common sense critical thinking pathways of mathematical thought?
..." According to the calculations done by Kip Thorne, most black holes would rotate with a speed that is 99.8% their mass.
6 ... Rotating black holes are also known as Kerr black holes "...
..."Charged black holes have two event horizons instead of one, and now rotating black holes have not only two event horizons but two photon spheres. It has to do with the fact that the black hole rotates, and, when it rotates, it "drags" the space around it into rotating with it. "...
..." A rotating black hole is different from the other two (once again!) in that its static limit is above its outer event horizon.
This is all very nice, but what does it mean?! It means that once you cross into the ergosphere, it is impossible to stay still. Even light rays are dragged along in the direction of rotation. However, you can enter and leave this region whenever you like, unlike the abandon-all-hope-ye-who-enter-here static limit/event horizon of the other two black holes. You can merrily weave in and out of the ergosphere with no nasty side-effects. It's a place of quirky spacetime of the black hole that we can actually visit and leave. "..
Note: In another article on rotational black holes { all black holes rotate says Kerr } is stated that where in above article, ergosphere is ellipsoidal, the other article says defines a torus of the surrounding particles, which according this above article includes photons { EMRadiation }.
..." The singularity of a
rotating black hole is different than that of a
static or
charged black hole. The Kerr geometry describes it as a ring, whereas the other two are points. As a result, it has some quirky properties. The oddest of which is not something I can prove to you right now. Some (nasty) calculations done by a C. T. Cunningham
8 have proven that gravity around the ring singularity is repulsive. Light actually bounces away from it and things actually bounce off it! Well, not everything. It depends on your approach angle. "...