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The fastest speed in the universe is not the speed of light. Humans may live in a three-dimensional space-time created by an advanced civilization

To understand the fastest speed in the universe, we must first understand what the speed of light is. The speed of light is actually the propagation speed of a light wave or electromagnetic wave in a vacuum and medium. The speed of light has nothing to do with the speed of the observer. Simply That is to say, whether the light source is stationary or in motion, the observed speed of light is actually the same. If the moving speed of a substance is close to the speed of light, the mass of the substance will also be infinite. No mass can reach the speed of light. In nature, only photons with zero mass can move at the speed of light.