Our expanding universe, that is, the world we can feel, develops as if it could be embedded in a larger space.
This larger space where our universe is contained exists is not only a mathematical trick used to have an image of the situation. In the simplest way of looking at it we can think in our universe as being a three dimensional sphere (not a three dimensional ball) which is expanding in a larger dimensional space. It is as a two dimensional sphere, a balloon, which lies in three dimensional space, which is expanding leaving the center, the big bang place, away from the universe at a given moment, which are the stars, etc. in the balloon.
The balloon began being a point in the larger space: the big bang. But then as it inflates, the big bang is left out of the balloon. Hence we can not point to the place of the big bang in our universe: the big bang lies in every direction.
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