What is space? This might be a difficult question to answer.
In physics, space is a form of material objective existence that is relative to time, but the two are inseparable. According to the Big Bang Theory, after the universe exploded from a singularity, the state of the universe split from the initial "one," creating different forms of existence and states of motion. The differential measurement of the position of objects is called "space," and changes in position are measured by "time." Space is expressed by its length, width, height, and size.
Physical space is more like a concept, a rule, a cosmic truth of how the universe operates.
The "Corpse Child" says: The universe in all directions is called 'yu,' and from past to present is called 'zhou,' what is referred to as the universe is the union of time and space.
