What is the space

The space is nothing. No one can say that he see or feel the space. All we can see or feеl is the matter.

There are many spaces invented by mathematicians and no one can say the they are really existing in the nature. My statement is that there are no any space really existing.

When we are looking at the smooth surface of the big pool we may exclaim: what the space! But we mean only the surface layer of the water but not the 2D plane as the mathematical space. If we take the strong microscope we may see how the complex is the upper layer of the water. Thus the space of the pool surface is abstract.

The same thing happens with the 3D space. We only can see the stars, planets, our environments but not the space itself. Therefore the cosmic space is not the space at all.

But we are to use the term of space and we are using it only for the description of the matter, for measurements a distance between the material bodies, for the arrangement of the bodies.

Such descriptions necessarily will be rather rough because we can't apply the exact form of the space to the real matter.