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Imagine a very large black hole, with a mass equal to a large number of galaxies. Assume a space station is in orbit around the black hole some distance from the event horizon at a point A. An astronaut in a ship, let's call him observer B, launches from the station toward the black hole. I have been told (correct me if I'm wrong) that from observer B's point of view, he wouldn’t feel any effects from approaching the event horizon—at least as far as he could determine from inside his spaceship. In fact, the visible event horizon, from his own point of view, would continually move away from him so that he could never actually reach it. Is this correct? If he were to watch the space station out his window, he would see it orbiting faster and faster. He would see the space stations occupants racing around. Eventually he would see many generations on the space station be born, live and die. As he approached the event horizon (as seen by him or the original Schwarzschild radius as seen by A?), he would see stars born and die and eventually galaxies form move out and disappear. He would see the entire life of the universe in an instant as he got ever closer to the black hole. Is this correct?
Mathematically, the observer on the space station could calculate these relativistic effects. In fact, observer A would calculate that on the other side of the event horizon, the space and time axes would actually be swapped relative to his own point of view. Of course, he cannot see beyond the event horizon, so this would be a strictly mathematical exercise.
Now this is based on my reading of several books on general relativity. If any of it is wrong, please tell me. Otherwise, I’m assuming I’ve interpreted things correctly. My thoughts turn to the following thought experiment.
Now, I do this thought experiment. I imagine many stars and galaxies moving around inside the event horizon of this black hole (remember it is very large). And I consider a layer S a fixed distance from the singularity, but located inside the event horizon as observed from some point, say our original station at A. Let’s assume a person is located at a point P on the surface S. Nothing between P and the singularity could be seen by this observer P. Any light between the singularity and P would move inward towards the black hole, so the observer at P would see nothing but blackness if he peered in the direction of the singularity. True?
What I want to know is if observer P peered outward, toward the universe, what would he see? I’ve been told due to gravitational lensing he would see all the light entering the event horizon concentrated somehow. I also want to know what the stars and galaxies located inside the event horizon but outside the shell S would look like to the observer at P. Is it possible that as he looked outward, he would be looking into the past? Is it possible that he would see all of space limited to his little shell S, and points further out than P would be points in his past? Is it possible that at the event horizon, he would see his entire shell contract to a point, as if it came from a big bang in his past? And is it possible that the spacetime he is unable to perceive, between P and the singularity, appears to be in his future? From his own point of view, he can’t perceive it, because nothing can reach him from that future (from closer to the singularity) without travelling faster than light.
I don’t know if any of this is correct. Just something I’ve been thinking about and it could be totally out to lunch.