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How long do we need to wait?
The age of the Milky Way is estimated for more than 12 BY. So why the dark matter in our galaxy didn't clump yet?
Well, can we claim that as we don't know how the ordinary matter can explain the activity in the spiral galaxy, we have decided that we need some support for extra gravity?
Therefore, can we agree that as we have decided that there is a need something that we can't see, can't smell and can't feel, let's call it dark matter and claim that it can only contribute extra gravity?
Did we even found even one particle of dark matter?
Do we really know how the gravity could spread the dark matter particles in the galaxy so it would fit to the requested formula?
As the dark matter is up to 100,000 LY it is very clear that the solar system and the Earth should constantly collide with dark matter particles as they orbit around the galaxy. So why we can't see a rain of dark matter particles falling on our heads?
If you think that the solar system is not big enough, then what about the spiral arms or ring? The thickness of the ring is 3,000 LY.
Don't you agree that it is quite massive object that should collide with the dark matter - if there was any dark matter?
If the dark matter can't shed its energy, then why do we ignore its impact?
As the total mass of the dark matter is at least 5 times bigger than the ordinary matter, why we can't assume that some of the cosmic energy is due to dark matter/energy?
If the galaxy with its ordinary matter/stars is changing much faster than the dark matter, then then how the dark matter can fit itself to changes in the galaxy?
Do you agree that if in the past the dark matter was OK for the Milky way, then as the galaxy had been surly changed in the last billions years - then the old dark matter density (that can't change fast enough) can't fit anymore to the current milky way?
In other words - why can't we just agree that our scientists have invented the idea of dark matter as they have no clue how spiral galaxy can work only based on ordinary matter?
That's pretty much exactly what dark matter is: a concept invoked to explain anomalies in the observations. That's how a lot of science works.
Density wave theory is not something I am well acquainted with, so I don't know if everything you've said is accurate or not.
Don't you agree that here must be a connection between the dark matter and the winding problem?
Therefore, again - do you confirm that based on this article we can understand that stars can hold themselves in the spiral arms by gravity?
So, do you accept the idea that in this article they clearly discuss about the impact of real gravity between two key elements in the spiral galaxy (without even one word about the dark matter imagination)?
QuoteQuote from: Dave Lev on Yesterday at 14:18:22Therefore, again - do you confirm that based on this article we can understand that stars can hold themselves in the spiral arms by gravity?Gravity can't hold things together as if they were solid objects, so I hope that's not what you meant by this question.
Quote from: Dave Lev on Yesterday at 14:18:22Therefore, again - do you confirm that based on this article we can understand that stars can hold themselves in the spiral arms by gravity?
Could it be that our scientists observe that the Bar and the spiral arms are connected as one solid object?
If not, then please explain what do you understand from this observation?
It means that their motions are associated with each other, at least temporarily. To say that two objects bound by gravity is solid is to greatly misrepresent what the word "solid" means. The Solar System travels through the galaxy as a unit, but it absolutely isn't solid.
The Bar and the spiral arms are connected (or their motions are associated with each other) by mutual attraction due to gravity as one temporarily object?
Quote from: Dave Lev on 21/06/2022 18:31:45The Bar and the spiral arms are connected (or their motions are associated with each other) by mutual attraction due to gravity as one temporarily object?That does seem to be the case.
As for the pattern you speak of below 3 kpc, I don't know the reason for that.
So how our scientists claim that they know how the spiral galaxy works while they don't have a basic clue how he Bar segment works?
Quote from: Dave Lev on 22/06/2022 07:28:13So how our scientists claim that they know how the spiral galaxy works while they don't have a basic clue how he Bar segment works?You seem to have equated one guy on a web site with the whole of science.Why is that?
If no one in the whole science community has a basic clue about it - why don't you give me a chance to explain how the entire spiral galaxy really works from A to Z?
Well, it's the time for the science community to explain how the spiral galaxy really works.
why don't you give me a chance to explain how the entire spiral galaxy really works from A to Z?
You think just because I don't know the answer that literally no one knows the answer? I'm not an astrophysicist.
They did.It's in the literature.Go and look it up.