Have you ever wondered how large the universe is? And if it really is infinite? Whilst it is still unknown, it looks very likely that our universe is infinite, but what about the possibility of infinity in both directions, from the infinitely large to the infinitely small? We used to think that the atom was the smallest element, now we know of many smaller particles. Has science found a limit to how small things really can be? There is so much more beyond our visible universe.