Time at the Event Horizon (both at and past it)


Based on what we know, if a human were to survive past the event horizon, would they see the universe fast-forward all the way to heat death? Would it move backwards? Or would spacetime break down in such a way that it’s impossible to know?

In: Physics

Well if you fall into a super massive blackhole, your body won’t be torn before you reach the event horizon… But that doesn’t mean you see the universe fast forward.. as you know, from an external observer’s view you show down at the event horizon and fade into red and disappear into nothing… You still haven’t crossed the event horizon, but you’re wavelength red shifts into nothingness. For your however, it would feel like the entire world becoming brighter and brighter to you get killed by the energy…


As you cross an event horizon, the light that you see doesn’t change in those ways. The light you see left many years ago, and it’s just like you, following the steeply curved spacetime. The steep curve makes much of the previously visible universe no longer visible, an effect like you see in a [curved mirror](https://skyandtelescope.org/wp-content/uploads/bh_illo_480px.jpg).

[This video](https://vimeo.com/8818891) shows an simulation of what it would look like to fall into a regular black hole. [This website by the creator](https://jila.colorado.edu/~ajsh/insidebh/schw.html) explains all the relevant physics.

It is a common misconception that you can see the entire future of the universe when falling in a black hole. This is not true. Also, the other comment here stating the outside universe would become infinitely bright is not necessarily correct. This is only the case for an observer *hovering* right outside the event horizon. An observer who falls into the horizon won’t see this.