Flat Universe

I asked Bing if the idea that the universe is flat had the heft of being a theory.

Bing replied.

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A flat universe is not a theory, but a possible geometry of the universe. 

It means that the universe has zero curvature and is infinite in extent. 

The curvature of the universe depends on the density of matter and energy in it. 

If the density is equal to a certain value called the critical density, then the universe is flat. 

If the density is higher or lower than the critical density, then the universe is curved.

Many cosmologists think that our universe is flat, based on observations of the cosmic microwave background radiation and other sources. 

However, this is not certain and there are still some uncertainties and challenges to this idea.

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I asked that question because I saw a presentation on the concept recently and it spawned a couple follow on ideas.

If the universe is flat that seems to imply that its depth is trivial compared to its length and width - or radii if the thing is circular (those being infinite).

With that relative thinness isn't it possible that there could be another universe stacked on top and one on the bottom?

And if that is possible, could there not be more in the stack?

Could that phenomenon not be as infinite as length and width, or radii, with universes stacked like servers in their rack, or vinyl LPs stacked in a pile?

Could not that "stackdimension" be infinite?

And if the universes (singular needs to be dropped if this is true) are so constructed, could that explain dark matter?

Dark Matter apparently exists; but what is it?

Nobody knows.

Or so it seems to all those physicists who pretty much take it as a dark and unexplainable fact of physics.

Lots of mass though.

Lots of gravity though.

So something is "there", wherever "there" is.

Could it be that there are a whole lot more of us than those of us "here" know about?

Could not all of us - "our universe" and all the others be in a stack in an infinite rack like some cosmic server farm; and could not dark matter and its gravity, and its mass, be really, not dark at all, but merely the indication of that infinite stack?

The effects indicate the cause often times, and the cause of dark matter might just be normal physics stacked to infinity: all that "stuff", stacked up and down, and all that "stuff " doing what "stuff" always does: have mass, speed, and gravity.

In that case, that stack would be the darkness.

That we know is there but can't see.

And migration across it is a currently random, but critically-necessary-to-be-understood phenomenon that will make - if understood - or break - if ignored, abandoned, forgotten or not understood - the human race's place in the order of things.

Or are all the servers in the stack human?

So, does it really matter? 

In any event, the geometry of that idea is significant.