The idea that our entire universe is within a black hole is an intriguing concept, but it is purely speculative and not currently supported by scientific evidence. While it is difficult to definitively rule out such a possibility, it is important to understand that the notion of our universe being inside a black hole is a hypothesis that goes beyond our current understanding of black holes and the nature of our universe.
Black holes are regions of spacetime with extremely strong gravitational forces, formed from the collapse of massive stars. They have a boundary called the event horizon, beyond which nothing can escape, including light. Inside the event horizon, the gravitational forces are so powerful that they result in a singularity, a point of infinite density and curvature.
The concept of our universe being within a black hole suggests that the black hole we envision is just a smaller part of a larger universe, and the event horizon we observe is actually the boundary of that larger universe. However, this idea remains highly speculative and lacks empirical evidence.
Currently, the most widely accepted model for the universe's large-scale structure is the Big Bang theory, which posits that our universe began with a singularity and has been expanding ever since. While there are still many open questions about the nature of our universe and the behavior of black holes, the prevailing scientific consensus does not support the idea that our entire universe exists within a black hole.