- #1
x_engineer
- 55
- 8
A simple paradox -
Imagine something falling into a black hole, starting at infinity. When it gets to the event horizon, its velocity has to be c. However, from the perspective of an observer outside the event horizon, its mass has become infinite, which means it would also have an event horizon and that event horizon swallows the entire universe. Thus if anything actually falls into a black hole, the entire universe also winds up inside the black hole.
OK, maybe we never get so see something actually fall in.
Imagine something falling into a black hole, starting at infinity. When it gets to the event horizon, its velocity has to be c. However, from the perspective of an observer outside the event horizon, its mass has become infinite, which means it would also have an event horizon and that event horizon swallows the entire universe. Thus if anything actually falls into a black hole, the entire universe also winds up inside the black hole.
OK, maybe we never get so see something actually fall in.