Our Universe appears to be expanding and cooling, having originated some 13.8 billion years ago in a hot Big Bang. However, it's plausible that what we see from inside our Universe is simply the result of being inside a black hole that formed from some parent Universe. Near a black hole, the slowing of time is extreme. From the viewpoint of an observer outside the black hole, time stops. As an object falling into the hole would appear frozen in time at the edge of the hole.
Mathematically, Yes Time stops at the Singularity of a Black hole.
And yes it could be possible that our Universe is inside a Huge Black Hole, However, what's even beyond that Black Hole? Another Universe or Another Black Hole? Well would it be possible for a Black Hole to exist within a Black Hole?
Well, I believe it's just different models and approaches to describe the Universe.
I have a theory about the Model of the Universe, and is that Universe will keep on expanding and then at some point in its fate, it'll start de-expanding (reverse expansion) towards the singularity, from where it started 13.779 billion years ago, and then the inflation will take place again, and this whole process will repeat.
However, the "new" universe that would be forming, would possible be different from the "old" one. That means, from a single singularity many universe can born, or Multiverse could be born.
And yes these are all just theories.
Our Universe appears to be expanding and cooling, having originated some 13.8 billion years ago in a hot Big Bang. However, it's plausible that what we see from inside our Universe is simply the result of being inside a black hole that formed from some parent Universe. Anything outside this surface including astronauts, rockets, or light can escape from the black hole. But once this surface is crossed, nothing can escape, regardless of its speed, because of the strong gravitational pull toward the center of the black hole. By their calculations, quantum mechanics could feasibly turn the event horizon into a giant wall of fire and anything coming into contact would burn in an instant. In that sense, black holes lead nowhere because nothing could ever get inside. This, however, violates Einstein's general theory of relativity. As black holes evaporate, they get smaller and smaller and their event horizons get uncomfortably close to the central singularities. In the final moments of black holes' lives, the gravity becomes too strong, and the black holes become too small, for us to properly describe them with our current knowledge. Near a black hole, the slowing of time is extreme. From the viewpoint of an observer outside the black hole, time stops. As an object falling into the hole would appear frozen in time at the edge of the hole.
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