OUR UNIVERSE IS FINITE

As we know that our universe is so huge and spread far and expanding continuously, but it is also true that there is a limit of the universe. As considered universe is the result of big Bang, but I am not justifying completely by it because such type of bang never creates so far space and one question arising here that what was the reason of that bang. Creation of the universe is mutual. Our universe seems like infinite, but it is not because nothing is infinite in the universe as the universe is finite itself. Our Universe is one kind of closed system which is either sphere or just part of a sphere.