Current estimate is that there is no border. It goes on forever. Space is infinite and increasing. Matter is fixed and static. So a bigger infinity divided

Current estimate is that there is no border. It goes on forever. Space is infinite and increasing. Matter is fixed and static. So a bigger infinity divided by a smaller infinity. Which means density is heading towards 0. This is heat death of universe. Now since dividing infinity by infinity is nonsense, this a sign our understanding is incomplete