well... just a bit of light into your question... there are some cosmological theories that say the universe can be 'closed'. it means it is limited, but have no end. if it is hard to imagine, think about the surface of the earth. you can walk in any direction as long you wish, and you will never find the 'end' of the earth. but the area of the surface of earth is limited. the same could happen in a 'closed' universe. you would walk in any direction for zilions of light years, and never find the end of it. even if the total amount of space (volume) of the universe is limited.