Matter in nature has two properties, which are both shape and change. Space is only a linear measure of the shape of an object, and time is only a comparison benchmark of the speed of change of matter, which is a periodic count after comparing with periodic signals. Although the units of length and time vary widely, the principle of comparing material changes should not be changed. These are two different benchmarks, and it is wrong to confuse or even equate them. The inference of special relativity is incorrect, and time will never go back. If we regard seeing the past as going back to the past, then we can form a time machine with a video recorder and a player, and we can go back to the past. What I see is like a thing of the past, and I can't communicate anymore. Like is not a thing after all.
For time and space, people can express it in different coordinate systems, using rectangular coordinate system or polar coordinate system, depending on your wishes. There is an uncertainty principle for measuring so-called elementary particles. My opinion is that the uncertainty principle is incorrect, but this phenomenon does exist at present. Because all the measuring tools we use at present are designed and manufactured by relying on the medium of light, light has an effect on the measured object. For small objects, this force can be ignored, but when measuring small objects such as elementary particles, this force cannot be ignored. With the progress of science and technology, people will find ways to measure them. We touch by hand, use ultrasonic measuring instrument, use radar and velocimeter, which are all based on the understanding of these signal laws. We should develop new tools to understand nature.
Every substance has a qualitative time and space. In order to compare, communicate and distinguish substances, we still need a unified time and space benchmark. Theory is created by people. Only with writing can people communicate widely. We use language to express matter, but it is either language or matter. Don't be confused.