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So it is theorized that there is a tyre pushing things around and keeping the outer edges of galaxies there.
originally posted by: Willtell
The crux of the matter is them finding out the universe has been speeding up rather than, as they supposed, slowing down.
Only some kind of DARK undetected ENERGY can be responsible for this.
Gravity and Centrifugal forces are not the same thing.
The pebbles which are relatively close will draw toward each other trying to escape the center point due to Centrafugal effect. This is gravity.
Centrifugal effect is caused by inertia: An object in motion keeps moving at the same speed in the same direction unless a force acts on it. Everything on the rotating Earth tries to keep moving in a straight line and fly off into Space. The force of gravity continuously changes this direction of motion, making objects move in circles around Earth's rotation axis.
The theories behind dark matter and dark energy were ad hoc to discrepancies observed that contradicted what we know about astrophysics.
The issue that caused science to consider dark matter and dark energy is that galaxies are rotating but they should be flinging out stars from the outer arms. Instead, the outer arms are chugging around at great velocity with nothing to hold them in place.
originally posted by: Devino
In my opinion the theory of dark matter does not satisfy the violation of the inverse square law nor how the amount of dark matter increases as it gets farther from the galactic center in such a way as to balance the rotation curve, keep it flat. There is an unknown force here at work and I don't think it's dark matter.
Well then, perhaps you could to enlighten me on "what is going on".
Then your opinion is without looking at the model or understanding what is going on.
I have read about it. I fail to see how it adequately explains the lack of galactic rotation curve. Perhaps you could help here as well. What evidence has been found that dark matter exists outside of the observed problem I just mentioned? How much money and time has been spent attempting to find dark matter and what have the results been? I need more than an ad hoc theory before I am convinced so until then I remain skeptical.
On the dark matter model, you might actually want to read about what it actually is and the structure it takes in relation to a galaxy before you write it off as you do.
Sure, I have a vivid imagination and can imagine all sorts of things but this is science and I need evidence before I am convinced. Until then I think we should spend time looking for alternatives.
It is pretty easy to imagine a very very simple geometrical structure filled with a almost flat density of 'unknown matter' which will completely flattern and give you what is observed.
Dark matter is a theory that was created to try and explain an observed problem. We do not know if it actually exists or not. If you think gravity is the only force that shapes galaxies then dark matter must be it, right?
Added, Dark Matter exists, but is jot related to dark energy, which I what I was talking about and irrelevant to this.