**The theory of the Holographic Universe**

The total summation of energy of our universe is about zero. It can also be said that the total mass is zero. Let's compare our universe with a photon of this universe. If we call the our universe A, and call that photon universe B, then through universe A we can see universe B is a particle moving in light speed, and vice versa. So in a photon universe our universe is no more than a photon. In fact, we can imagine all the particles are just like other universes. Our universe includes all the other universes, and other universes also include our universe.