According to our current understanding of the universe, there is a maximum speed at which information and objects can travel, known as the speed of light. In a vacuum, the speed of light is approximately 299,792,458 meters per second (or about 186,282 miles per second). This value is denoted by the symbol "c" in physics equations.
The speed of light plays a crucial role in the theory of relativity, which is a foundational theory in modern physics. According to this theory, nothing with mass can travel faster than the speed of light. As objects with mass approach the speed of light, their relativistic mass increases, and it would require an infinite amount of energy to accelerate them to or beyond the speed of light.
In terms of the expansion of the universe, the universe itself is not bound by the speed of light. Space itself can expand, and this expansion is not constrained by the limitations of objects within it. The current prevailing model of the universe's expansion is known as the cosmological constant or dark energy-driven expansion. This model suggests that the universe's expansion is accelerating over time.
However, it's important to note that the exact mechanisms and limits of the universe's expansion are still subjects of active research and investigation. Our understanding is based on current theories and observations, and future discoveries may refine or alter our understanding of the maximum speed of expansion or introduce new concepts altogether.