According to our current understanding of the universe, there is no evidence to suggest that the universe has a center in a traditional sense. The prevailing cosmological model, known as the Big Bang theory, suggests that the universe began expanding from a highly compressed and hot state roughly 13.8 billion years ago. However, it is important to note that the expansion of the universe does not imply that it originated from a single point in space.
Instead, the expansion of the universe can be visualized as space itself stretching, much like the dots on the surface of an inflating balloon. In this analogy, every point on the balloon's surface moves away from every other point, but there is no single point that represents the center of the expansion.
It's also worth mentioning that the concept of the "center" of the universe can be tricky to define. The expansion of the universe is happening uniformly in all directions, and observations indicate that it is isotropic, meaning that the distribution of matter and energy appears roughly the same regardless of the direction we look.
As for what would happen if we were to reach the center of the universe, it is currently unknown because there is no established notion of a center. Since the concept of a center implies a central point in space, it is difficult to speculate on what would happen there. Our current understanding of the universe suggests that it is vast and possibly infinite, with a variety of structures and phenomena distributed throughout.
It's important to note that our understanding of the universe is continually evolving as scientific knowledge advances. New observations and theories may lead to a deeper understanding of its structure and properties, including the question of its potential center.