[JadeNB]

> Voids are a description of an area that has relatively less matter density than the average of the universe, not objects themselves, so I'm not sure what you mean by a void "moving".

I think that was exactly the point that your parent https://news.ycombinator.com/item?id=32342806 was making:

> Does a void move? No really, by our current definition of 'void', does a void move or is its position and shape solely defined by the objects moving into and around it?

That is, I think that they were not asking a factual question—"obviously voids can move, but do they?"—but rather a sort of ontological question—"does it even make sense to ask whether voids move?"—just as you are.