Can singularities be ever formed from an outsiders perspective?

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As far as I know, as an object gets closer to an event horizon, gravitation time dilation makes it move slower from an outside perspective, so that it looks like it take an infinite amount of time for the object to reach the event horizon. It seems like a similar process should slow the formation of the black hole itself: As the star collapses, its gravitational time dilation make itself collapse more slowly.

This makes me wonder: from a perspective of an outside observer, can a singularity ever form?

E.g. someone on earth observers a massive star collapse, forming a black hole. From his perspective, the mass gets closer and closer, but does it ever form a singularity before the black hole evaporates?

Furthermore, if from a perspective of a mass collapsing into a black hole it’s time slows down and an outside universe “speeds up”, could this mean that the black hole evaporates before me, the mass, can become singularity?

In: Physics

4 Answers

Anonymous 0 Comments

From what I have found, [especially on Physics SE](https://physics.stackexchange.com/a/21431/297639) no singularities can even be formed. A collapsing mass can come close to it, but from a technical point of view there is no singularity. Those answers seems to be in contradiction to general knowledge that ‘we have no idea what happens at singularity’, since there are no singularities in the first place.

I’m more confused the more I read about it.

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