The idea that our entire universe is within a black hole is an intriguing concept, but it is currently a matter of speculation and not supported by scientific evidence. While it's fascinating to consider alternative theories and possibilities, it's important to note that our understanding of black holes and the structure of the universe is still an active area of research.
Black holes are regions in space where matter has collapsed under its own gravitational pull to a point of infinite density, known as a singularity. According to our current understanding, black holes have an event horizon—a boundary beyond which nothing, including light, can escape their gravitational pull. Inside the event horizon, the gravitational forces are so strong that our conventional understanding of space and time breaks down.
The concept that our universe could be within a black hole arises from certain speculative ideas in theoretical physics, such as the hypothesis of black hole cosmology or the idea of a "parent" universe giving rise to multiple "child" universes through black holes. These ideas are still highly theoretical and not yet supported by direct evidence.
At present, the prevailing scientific understanding is based on the Big Bang theory, which describes the expansion of the universe from a singular point. Our universe is thought to have started from an extremely dense and hot state and has been expanding ever since. While our understanding of the universe continues to evolve, the idea that our entire universe exists within a black hole is not currently a widely accepted or supported scientific view.