alright so the universe is infinite. if it is so, how possible it is for it to expand? when something is absolute, the state of it being changed is impossible. you cant increase nor decrease ∞.

so they say its expanding, therefore, if with a new-fangled advance device to measure the size of universe at the speed of light so we wont miss a unit in calculation, we should be able to estimate the size of universe by measuring the perimeter it has covered at a specific time before it expands further.