- #1
Ookke
- 172
- 0
For outside observer, an object falling into black hole seems to freeze at event horizon and never cross the boundary and proceed inside the black hole. This is of course not the case in the falling objects own reference frame. Depending on the size of the black hole, a falling object may not even notice anything out of ordinary.
However, in an outside observer's reference frame, the object freezes at the event horizon and stays there forever, until the end of the universe. The falling object will be hit by enormous amount of photons, which are also blueshifted because of gravity at the black hole. No matter how far away, or how distant future, a photon with proper direction will reach the falling object at constant speed c and hit, because the falling object is still there waiting just above the event horizon.
Actually I don't think this is correct description of what happens, but I cannot specify any reason why this is incorrect. If the object stays there, and it's hit by photons until the end of the universe, it will fry. And if it does, it must do that in any frame (also in the falling object's own frame) because different reference frames cannot disagree about local events. This is contradictory to description that falling object may not notice anything special.
However, in an outside observer's reference frame, the object freezes at the event horizon and stays there forever, until the end of the universe. The falling object will be hit by enormous amount of photons, which are also blueshifted because of gravity at the black hole. No matter how far away, or how distant future, a photon with proper direction will reach the falling object at constant speed c and hit, because the falling object is still there waiting just above the event horizon.
Actually I don't think this is correct description of what happens, but I cannot specify any reason why this is incorrect. If the object stays there, and it's hit by photons until the end of the universe, it will fry. And if it does, it must do that in any frame (also in the falling object's own frame) because different reference frames cannot disagree about local events. This is contradictory to description that falling object may not notice anything special.