What is outside the universe?

The theories that cosmologists and astronomers have proposed to explain this are essentially speculative; they could suggest that the universe is infinitely large and that nothing exists outside of it, or they could suggest that there are multiple universes.

Since the universe by definition includes all of space, time, matter, and energy, the concept of "outside" the universe is not well-defined within the parameters of our current understanding of physics, the question of what lies outside the universe is currently beyond the realm of scientific understanding and exploration.

The question of what lies outside the universe is a topic that falls into the realm of speculative cosmology and theoretical physics. Currently, there is no definitive answer to this question within the scope of scientific understanding. The universe, as we understand it, refers to the entirety of space, time, matter, and energy that exists. Beyond the observable universe, our understanding becomes limited due to the constraints of our current observational capabilities and theoretical frameworks. Some theories propose the existence of a multiverse, where our universe is just one of many universes that exist within a larger, overarching structure. However, these ideas remain speculative and are yet to be conclusively confirmed or disproven through empirical evidence. It's essential to acknowledge the limitations of our current knowledge and remain open to new discoveries and advancements in cosmology and physics that may shed light on this profound question in the future.