"Parallel space" is a hypothesis-based theory. Assuming that we surpass the speed of light, it is possible to break through the time limit, go back to the past and change history. At this time, the timeline diverges, and the changed historical space and realistic space form a "parallel space".

Parallel space means that in another space of the universe, that is, in another space, an identical universe is formed, and there is a person who looks like you. From the point of view of quantum science, the same particles can appear in two different spaces, that is, the particles that make up our present space may be in another space.

Detailed introduction:

Parallel universe, in astronomical terms, refers to the universe of parallel forces, which is a pure elementary particle universe produced by parallel forces and forms a multiverse theory with the known gravitational planetary universe. So the multiverse contains many different interacting universes.

Parallel space is called parallel space because it is parallel to our world. That parallel space and our present world are like two straight lines that are always parallel. It is impossible to overlap and meet together, so we can't perceive the world, so some scientists think that dreams are our only connection with parallel space.