Matt, thank you for the encouraging appraisal of my Hypothesis, and an extra thank you for so clearly understanding what I am trying to say. Your answer and description of Galactic rotations is exactly what one of the things this Hypothesis or maybe I can call it theory as it is supported by all the evidence we have for GR, anyway it is exactly one of the things that fall out of it.
I do see spacetime as a no viscosity fluid.
Although I have been toying with this idea for several years now, I have started to notice lately that more and more physicists without actually coming out and saying so, are starting to seriously consider Spacetime as an actual medium.
Our friend Michio Kaku being one of them. Unfortunately even though they might make appropriate sounding descriptive comments, when it comes down to official theory and the Mathematics used to describe situations within spacetime, they all stick to a fixed coordinate treatment of spacetime.
It seems like their subconscious is trying to tell them that Spacetime like everything else in this Universe is not static, but their conscious refuses to allow it. Michio Kaku can be excused as he has devoted most of his efforts in String Theory. I just don't understand why for 100 years no one has proposed that Spacetime might be allowed to move. After all that is the only change I am proposing to GR. Everything else seems to find it's own answers after that.
Even at the Quantum level, how many times have I heard the explanation that when an atom drops from a higher orbital to a lower one it does it instantly. It does not travel through the Spacetime in-between the two different states. Surely that is a behavior that should suggest something is happening here that needs extra explanation.
Anyway enough of my frustrations and again thank you for understanding my very amateur speculations.
I'm likewise glad to find someone who is exploring the same territory I've been thinking about.
If you're interested, I created the following theory video, about tweaking General Relativity to get rid of the need for Dark Matter.
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