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Bonus points for articles or links to said facts. I demand rabbit-holes to explore
You may have heard that you can survive a short while after falling below the event horizon of a supermassive black hole. If we extend general relativity further in, for rotating black holes there is an inner-horizon where escape velocity falls back below that of light.
As you approach this inner horizon though, all the matter and spacetime that has ever fallen in and will fall in gets compressed into a single moment at the surface. The dying star matter from its creation would be just in front of you, and everything that falls in in the future would rush up behind you. (Spaghettification would still kill you before getting that close though.)
Infalling matter also experiences an effect called ‘mass inflation’ where energies near the cauchy horizon approach that of the big bang. This also makes the horizon catastrophically unstable, but I haven’t seen how this instability might resolve.
Also, depending on whether you are moving inwards or outwards as you cross the cauchy horizon, GR predicts you will end up in one of two disconnected inner-universes.
You may have heard that you can survive a short while after falling below the event horizon of a supermassive black hole. If we extend general relativity further in, for rotating black holes there is an inner-horizon where escape velocity falls back below that of light.
As you approach this inner horizon though, all the matter and spacetime that has ever fallen in and will fall in gets compressed into a single moment at the surface. The dying star matter from its creation would be just in front of you, and everything that falls in in the future would rush up behind you. (Spaghettification would still kill you before getting that close though.)
Infalling matter also experiences an effect called ‘mass inflation’ where energies near the cauchy horizon approach that of the big bang. This also makes the horizon catastrophically unstable, but I haven’t seen how this instability might resolve.
Also, depending on whether you are moving inwards or outwards as you cross the cauchy horizon, GR predicts you will end up in one of two disconnected inner-universes.
Google ‘black hole cauchy horizon’ to go deeper!