4 ms·
Relevant discussion: https://physics.stackexchange.com/a/79086 https://physics.stackexchange.com/a/79086 > i.e. there is no spacetime path which ever crosses t
by hoten 6y ago
Relevant discussion: https://physics.stackexchange.com/a/79086 https://physics.stackexchange.com/a/79086
> i.e. there is no spacetime path which ever crosses the event horizon
As I understand it, there isn't, from the perspective of an observer external to the event horizon.
(warning: I am only an avid watcher of PBS Spacetime)
- pdonis 6y ago> As I understand it, there isn't, from the perspective of an observer external to the event horizon. This is not correct. An observer outside the horizon cannot see anything at or inside the horizon; but that doesn't mean he can't calculate that there is a region of spacetime inside the horizon, from observations he can make from the outside. He can.
- colechristensen 6y agoAs I understand it at this point... there is no round trip spacetime path to the horizon and back and best-case light which hits (or is arbitrarily close to hitting the event horizon) can get back to you the moment the black hole finally evaporates. However the first half of that trip is possible and happens in finite time.