### Event horizons

Posted:

**21.08.2003, 12:41**I've just been reading Steven Hawking's

It says that no-one in the external universe would see any matter cross the event horizon of a black hole because of time dilation. The matter crossing the event horizon does cross it in its own time frame but would observe the entire history of the universe as it goes by.

However it seems to me that the matter never crosses the event horizon. This is why:

The outside observer sees the black hole evaporate in a finite time by Hawking radiation. Given that it takes infinite time (seen from an outside observer) to cross the event horizon, the black hole evaporates before the matter ever crosses the event horizon.

Thus nothing ever falls into a black hole.

Is this reasoning correct? I'm not entirely sure.

*The Universe in a Nutshell*and it talks a lot about black holes.It says that no-one in the external universe would see any matter cross the event horizon of a black hole because of time dilation. The matter crossing the event horizon does cross it in its own time frame but would observe the entire history of the universe as it goes by.

However it seems to me that the matter never crosses the event horizon. This is why:

The outside observer sees the black hole evaporate in a finite time by Hawking radiation. Given that it takes infinite time (seen from an outside observer) to cross the event horizon, the black hole evaporates before the matter ever crosses the event horizon.

Thus nothing ever falls into a black hole.

Is this reasoning correct? I'm not entirely sure.