What is the spacetime

Due to the fact that there are neither any space, nor any time there is no any spacetime too.

The theory of relativity based on the notion of spacetime is the theory of nothing. It is a mathematical theory related to the abstract, non-existing objects. The special theory of relativity tells about the transformation in the spacetime alleged might be seen by the real-existing observers which are moving with respect to each other. But they can't see neither space, nor time because they can't see fictions.

The general theory of relativity relies on that there is commmon spacetime which incurvation is responsible to the gravitation between the bodies. The material body influences on the spacetime by such manner that the curvature of the circumambient space and the current time are changed. But the spacetime is imaginary object and it can't therefore influence on the material body. The nature of gravitation is other.

When a real observer sees the moving body he only can imagine how the other observer also moving can see this body. And he can use the notion of the space, the time and even the spacetime for description of this motion. But it will be the imaginary picture of the reality, which can coincide or not with the reality itself.

Thus to check the theoretical picture one need to compare the theoretical results with the experimental data. If they coincide with sufficient accuracy one can say the the theory is good for depicting of the reality.

Can we say that the theory of relativity is good? What is measured on the famous Michelson-Morley experiment? Did they see the space contraction or the time delay? No. They see that the result is too small if the suggestion of the ether wind to accept. But what is the ether (or aether)? We may refer to the wikipedia and see that there is no one concept for it.

Therefore we are to do next topic where we will determine what is that mean.