Cosmological Red_shift : shouldn't everything be expanding?

"Cosmological Red_shift : shouldn't everything be expanding?"

Bound systems, are able to compensate through their "force systems".

"If the space between galaxies is said to be expanding or new space is being created : Why?"

Net production of entropy. Net production of intermediate states.

"is this new / expanding space not being created / expanding between molecules, atoms, protons, electrons, etc...

In other words : why isn't everything getting bigger?"

To not expand everything, is to keep the speed of light constant. So the "laws of physics" locally conspire to disallow local expansion. As the rate of expansion increases of course, "local" becomes smaller and smaller...

And for a more formal answer:

http://www.astro.ucla.edu/~wright/cosmology_faq.ht...

[EDIT:

Let me add, space is not stuff. It provides no "drag" on objects / particles. Space is just "momentum history", sort of like a cash register tape. More history, means more space, more "cash register tape".

]

There are four fundamental forces to the universe, or so it is thought. the expansion of which you speak occurs only in the domain of gravitational dominance, and is essentially a case of the gravitational force being too weak to maintain proximity of mass against the forces of expansion. Apparently that force or those forces responsible for expansion are not powerful enough to offset the attractive forces acting on the microscale.

That is, the causes of expansion do not change the nature of the fundamental forces but only act against those forces, and the only domain where the expansionary impulse dominates is within the field of gravity dominance.

It is.

EDIT:

One more thought on your original question:

You are on a train with elastic railcars, 1 m long (space-time). You are standing on a geometric point on the coupling between 2 cars (Your FoR). The train is being uniformly accelerated, so the cars are stretching away from you in both directions (space-time expansion). The cars stretch 1 mm every second and there is a laser firing photons at you from the far end of each railcar. Thus, you can find how fast the far end of the railcar is moving away from you (Notice you are not moving relative to the point you are standing on, but what would an observer one car away say.) So, you measure that every second the far end of the railcar moves 1 mm away from you. Now, the interesting point: The end of the car 2 cars away moves 2 mm because both cars stretch. 3 cars away, 3mm, etc. So, for the laser 3 cars away you measure that it is moving away at 3 mm/second. The car a km away is moving away at 1 m/s. Far enough away the lasers are moving away from you at the speed of light. That laser and every laser farther away from you cannot be observed.