The concept of what lies beyond our own universe is still a subject of speculation and ongoing scientific exploration. While the multiverse theory is one hypothesis that has gained popularity in recent years, it is important to note that it remains speculative and lacks direct empirical evidence at present.
The multiverse theory suggests the existence of multiple universes, each potentially with its own unique properties, laws of physics, and even fundamental constants. This idea has been proposed as a way to explain certain observed features of our universe, such as the fine-tuning of physical constants and the apparent complexity of our existence. However, it is worth mentioning that the multiverse theory is not the only hypothesis put forth to explain what might lie beyond our universe.
Other theories and models have been proposed as well, such as the idea of a cyclic universe, where our universe undergoes a cycle of expansion and contraction, or the concept of a higher-dimensional "brane" universe in the context of string theory. Some theories also propose the existence of parallel universes or hidden dimensions beyond our current understanding.
It is important to emphasize that these ideas are still theoretical and subject to further investigation and refinement. The nature of what lies beyond our universe remains a topic of active research in cosmology, theoretical physics, and related fields. As our scientific understanding continues to advance, new insights may emerge, potentially leading to a more conclusive explanation.