What is outside the universe?

   What is outside the universe? 

So is a universe in the middle of emptiness? The fact is: emptiness and vacuum are relative. Because we are in the middle of the universe. We cannot measure things that are outside the universe. If we want to measure differences between two systems. We must see both of those systems. 

We can think that water is one system and the air is another system. Also, space around the earth and finally the universe are systems. And if we are in the middle of a swimming pool we cannot measure the pressure. Or actually, there is no absolute pressure. We can measure the differences in the pressure by comparing them with some other systems. Or some other pressures. 

We think the universe is a bubble in the middle of total emptiness. In our models' universe is the bubble in a vacuum that pulls energy or wave movement travels away from it. And that causes cosmic inflation. So in the universe is overpressure that pushes wave movement to the vacuum around it. And that means the universe is like a balloon that expands forever or ends its life in the Big Crunch. That end depends on the geometrical shape of the universe. 

But then we can ask if the middle of nothing is the universe's position, what means nothingness? And here, I don't mean multiverse. The density of the material is relative. When we are in Earth's atmosphere we know that we are in the middle of emptiness. When we dive into the swimming pool or in the water we can think that water continues forever.

 So if we would be like fishes, and lived our entire life in water, we might think that atmosphere is low pressure or a vacuum. But for the creature. For those who live outside the water on drylands, the atmosphere's pressure and density are normal, because that creature is in the gas. And that creature thinks that the vacuum begins in space. 

And when we travel outside our atmosphere we think again that we are in a vacuum. So here you can see that vacuum is relative. When we are in the middle of the system we are hard to estimate its thickness and density. 

We can think that water and air are systems. And dimensions are like water and air. If we are in the middle of water we are hard to estimate the density of water. For estimating some system's density we must step out from the system. That we can compare their differences. For us, water is denser than air. But for fish, it doesn't feel denser than anything else. The reason for that is fish spend their entire life in the water. 

The same way we are living in the universe our entire life. We cannot see another system than the universe where we are living. That's why we cannot measure the differences between the universe and the space around it. 

There must be something where we can compare that thing.  If we are in the water, we can estimate the density of water by comparing it with air.  We must compare that thing to something. So that's the reason why space outside Earth's atmosphere seems empty, but in real life that is away from emptiness. 

So in this model, there is material or wave movement outside the universe. The universe would be in the middle of the giant superstring that is so weak that wave movement from the universe pushes it away. So that means there is the possibility that the universe is in the middle of extremely large, and thick waves. 

If we think this wave is the third dimension we can say that dimension itself is material. And the material can form in the dimension because the dimension is not empty. This explains why the universe formed in the third dimension from the thing that seems empty. 

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