Sentence:  The diameter of a <WSD>protomatter</WSD> unit is the smallest possible separation of space. <WSD>Protomatter</WSD> is durable because it is indestructable. It is not possible to destroy a piece of nothing. Space is nothing. <WSD>Protomatter</WSD> is space. 
Meaning of the word marked with <WSD> tags:  A hypothetical substance from which the universe is created.