I am playing with thought experiments to try to improve my comprehension of relativity. Hopefully I can get some feedback to further enlighten my understanding. I begin with the assumption that orbital trajectories are inertial straight-lines in space-time curved by gravity. Objects in motion tend to stay in (circular) motion around a gravity well except to the extent that they are forced further into or out of the well, right? Also, any given altitude of a given gravity well should have a specific velocity of free fall, correct? In other words, at any given distance from a gravitational center, any two objects should orbit at the same speed. This speed could be seen as a natural characteristic of the particular space-time path followed by the orbiting-satellite, no? I am even inclined to call an object moving at such a speed as to achieve perpetual orbit "at rest" in its own frame, but this may be going too far, I'm not sure. Anyway, the issue I'm trying to get at is that an object/satellite orbiting a black hole would have to travel at a speed sufficient to avoid descending into the gravity well of the black hole. Therefore, at the Zwartschild radius distance from the black hole's center, I would guess that the velocity needed to orbit the black hole without descending further into its gravity well would be the speed of light. However, I believe that mass/momentum/energy of objects approaching the speed of light must increase infinitely for them to reach the speed of light. Therefore an object orbiting a black hole at its Zwartschild radius would attain maximum energy, wouldn't it? Attaining maximum energy would, I think, have to involve conversion of matter to energy obey the law of conservation of matter-energy. The other possibility I can imagine is that length contraction and space-time dilation would absorb the increasing energy. In that case, the object/satellite approaching the speed of light would shrink according to its acceleration, which would be accompanied by a corresponding dilation of space-time (outside the black hole) from its perspective. Inside the black hole, I think that space-time would contract proportionately to the length-contraction of the object, and as such the object would perceive itself as not changing size relative to its surroundings. However, from the perspective of an observer outside the black hole, the object would appear to shrink to the point of disappearance along with some red-shift, I think. The reason I throw in "redshift" is because I wonder if very distant galaxies, which appear to be exiting viewing range because of the universe expanding, are not actually exhibiting black-hole entrance behavior. The reason I consider this plausible is because velocity is always relative to a point of reference. Therefore it seems that a galaxy's apparent velocity due to the universe expanding over a long distance is no different than its actual velocity relative to the point of observation. So, for example, the disappearance of an object that would be caused by traveling away from it at the speed of light should have the same effect on the object left behind as it does on the object leaving. I.e. both objects appear to each other as if they were accelerating beyond the speed of light, which is the same thing as crossing the Zwartschild radius of a black hole. I'll stop here since I've probably already lost most readers with such a long post. Sorry if this is viewed as inappropriate for this sub-forum. I realize that the end of this post begins to sound like a crackpot theory, but I'm just trying to elaborate some modeling assumptions that seem to fit with these notions of relativity and get feedback about how I may be misinterpreting the theories. Thanks in advance for any insights.