[AntonioLao]

brighter light cast darker shadow if the matter between is unchanged. What is not light nor matter is the shadow. What is not shadow nor matter is the light. What is not light nor shadow is the matter. These are the three fundamental components of the universe.

What lies in the shadow is the spacetime structure. What lies in the light is the energy of potential and kinetic. What lies in the matter is the substance of charge and mass.

The universe can never be emptied of these basis states of existence. At one time or another, it exists in one or in combinations of these components.

What science hopes to do is to determine the various amounts and proportions of these components between time zero and infinity.

At time zero, the universe is completely in the shadow, which is the BB singularity where one physical dimension or one directional property are both meaningless and no physical laws can be derived from them.

[AntonioLao]

At the Planck time, the states of matter and energy begin their fight for domination over the ruling dominion of the shadow. Each fighting for its own selfish desire to exist and for self-preservation. The violent struggles is vividly described by the inflationary theory. And the fight is heated up by the extreme temperature. 14 billions years later, this fight has slowed to a meager heat of about 4 degrees kelvin and there is a near-equilibrium point between the gravitational energy and radiation energy. But what is not matter if its not just energy divided by square of light speed? What is not energy if its not just continuous space divided by light speed? But what is not continuous space if its not just the square of energy? For the true essence of the shadow is just the square of energy. So, when science reaches this realization of the shadow, the cycle begins once again and the fight for domination starts anew and go on forever till the end of eternity!

[Guille]

Antonio,

The shadow is not made of things. Thus it is nothing. It is just a product from the effect of light to matter. Shadow cannot be considered another important part. Shadow is just the opposite of light. Shadow is the absence of light. Thus, only matter and light are important. Of course, don't forget the forces.

[AntonioLao]

figuratively speaking, the shadow can be made to stand for the spacetime continuum.