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If you went for a walk in a straight line, you would actually go around the balloon and end up where you started, despite not being aware that you were travelling in a circle.

If you went for a walk in a straight line, you would actually go around the balloon and end up where you started, despite not being aware that you were travelling in a circle.

The theory goes that the three dimensions of our universe that we can see are like the two dimensions of the surface of the balloon, which wraps around on itself in another dimension, so that if we travelled through space in a straight line, we would eventually return to our starting point.

The theory goes that the three dimensions of our universe that we can see are like the two dimensions of the surface of the balloon, which wraps around on itself in another dimension, so that if we travelled through space in a straight line, we would eventually return to our starting point. The fourth dimension is [[time]] and [[String theory]] holds the universe exsists right up to [[The Tenth Dimension|ten dimensions]].

One consequence of this idea is that the universe therefore has no edge (just like there is no edge to the surface of a balloon) and therefore no center.

One consequence of this idea is that the universe therefore has no edge (just like there is no edge to the surface of a balloon) and therefore no center.