The universe is not infinite. If you were to explore any facet to the extreme searching for infinity then the laws of physics that you know will break down and not become applicable any more. An example would be when you accelerate an object towards the speed of light. It takes an ever increasing amount of energy, and warps the comman mans concept of time and mass. When searching for the edge of the universe I'm sure that this is what you will find. My guess is you will reach a point where the concept of time & space itself breaks down, and if time & space don't exist then what we would classify as the "universe" doesn't exist.
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