The statement that "nothing moves at a certain speed into infinity" is based on the principles of special relativity, which is a fundamental theory in physics proposed by Albert Einstein. According to special relativity, the speed of light in a vacuum, denoted by 'c,' is considered to be the ultimate speed limit in the universe.
In special relativity, it is postulated that as an object with mass approaches the speed of light, its relativistic mass increases, and the amount of energy required to further accelerate it also increases. At the speed of light itself, the relativistic mass would become infinite, and it would require an infinite amount of energy to reach or exceed that speed. Therefore, it is believed that no object with mass can ever reach or exceed the speed of light.
This concept is often summarized by stating that "nothing with mass can travel faster than light." It means that no particle, spaceship, or any other physical object composed of matter can attain or surpass the speed of light. However, it's important to note that this limitation applies to objects with mass, and certain massless particles, such as photons (particles of light), always travel at the speed of light in a vacuum.
Based on our current understanding of physics, this statement holds true, and the speed of light remains an absolute limit for the movement of physical objects in the universe.