Why describing the expanding speed of the universe is difficult?

Why describing the expanding speed of the universe is difficult?

When Edwin Hubble described the Hubble constant in the 1930's he didn't know how difficult the metering the expanding speed of the universe is. The thing that makes it difficult is that we are on the planet, which is part of the expanding entirety. And the Earth is moving in the same direction as the other universe. Or in the same direction with the segment of the universe where the Earth is locating.

The thing is that if we would want to meter the expanding speed of the universe we must travel outside it, or the other version is that we must find the point, what is the opposite side of the bubble or universe, and meter the escaping speed between the Earth and that point. Then we must division that speed by two, and then we can get the expanding speed of the universe.

And what makes the expanding speed of the universe so interesting? The thing is that when the big bang happened, that thing gave the punch for the shockwave, what we are calling as the universe. The thing about the expanding speed of the universe is that it describes the end of the universe. If the expanding speed of the universe is higher than the gravity, what is pulling the universe back to the point, where the big bang happens the universe would be open. That means that the universe ends its life in the endlessly continuing radiation.

But if the expanding speed of the universe is lower than the gravity, that means that gravity wins. If gravity wins the universe is collapsing. And there is a possibility that the new universe is forming. This thing requires that the singularity where all material in the universe is collapsing. And that is called the parallel universe. The idea is that the universe is the continuum, where big bangs are repeating one after one in an endless continuum. But there could not be endless continuums of the cases. There must also be the first and the last event in the series.

But is the new universe similar to our universe? There is a possibility that the large mass of radiation and material would go outside of the affected area of the gravity of the universe which means that the universe- big bangs cannot continue forever.

Sooner or later the mass of the bubble is turning too low, that the new universe cannot form, and those universes would live an extremely short time because the material would turn too low. That means the long-existence entireties cannot form anymore, because the low-mass universe cannot stay a very long time until it collapses.

And low-mass universes are losing material faster than high-mass universes. So where that continuum starts, and that means that this version of the parallel universe theory gives more questions than answers. The biggest of those questions is where and when was the first big bang in that series?

Sources:

Expansion of the universe: https://en.wikipedia.org/wiki/Expansion_of_the_universe

Hubble constant: https://www.livescience.com/hubble-constant.html

The Nature-magazine article: https://www.nature.com/articles/d41586-019-02198-z

Parallel Universes: Theories & Evidence: https://www.space.com/32728-parallel-universes.html

Image: https://en.wikipedia.org/wiki/Expansion_of_the_universe

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