The fastest thing in the universe is generally considered to be light. In a vacuum, light travels at a constant speed of approximately 299,792 kilometers per second (or about 186,282 miles per second) in a vacuum, denoted by the symbol "c." This speed is often referred to as the "speed of light."
Space itself does not have a speed. It is the medium through which objects and phenomena, including light, travel. Space can be affected by gravity, curvature, and expansion, but it does not possess an inherent velocity.
It's important to note that the speed of light is the maximum speed at which information or causal influences can propagate through the universe, according to our current understanding of physics. According to Albert Einstein's theory of relativity, nothing with mass can reach or exceed the speed of light. However, it is worth mentioning that there are other aspects of the universe, such as the expansion of space, that can create the illusion of objects moving away from us faster than the speed of light on cosmological scales.