4 ms·Depends on when you look at it.by ahknight 13y agoDepends on when you look at it.evanb 13y agoThe average density of the universe is the same as 1 hydrogen atom / cubic meter. Pretty damn empty.Almaviva 13y agoThe Earth, by volume, has less than 1 person per 100 cubic kilometers. Since a lot more people could fit in that space, it's underpopulated, right?