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Quote from: Dave Lev on 19/11/2022 06:09:09Hence, as long as the star is interacted by gravity to the arm, it would go with the arm wherever it goes.Quote from: Kryptid on 19/11/2022 06:03:12Only to an extent.
Hence, as long as the star is interacted by gravity to the arm, it would go with the arm wherever it goes.
Only to an extent.
"Hence, as long as the star is interacted by gravity to the arm, it would go with the arm wherever it goes."
In the same token the spiral arm would keep them all in the galactic disc and they would have to go wherever the spiral arm goes.
To get better understanding about this issue let me use the Sun/Earth/Moon system:The Moon is interacted by gravity to the Earth and it would go with it wherever the earth goes.The Earth (or actually the Com of the Earth/moon) is interacted by gravity to the sun and it would go with it wherever the sun goes.Therefore, the moon and the earth are not directly interacted by the center of the galaxyTheir "Gravitational job" is to keep themselves under the gravity interaction with the Sun.In the same token, the Sun is not directly interacted with the center of the galaxy.Its "gravitational job" is to keep itself under the gravity interaction with the Orion arm and as the Orion arm orbits around the galaxy, the sun will follow.
We think that the Moon orbits around the Earth, but in reality it orbits around a common center of mass with the Earth. Let's call this point as ComE.This ComE orbits around a common center of mass with the Sun. Let's call this point as ComSTherefore, we already see two stages of gravity bonding.Hence, while the moon is bonded locally with ComE and this comE is bonded with ComS, then although the moon orbits locally around a common center of mass, it goes wherever the Sun goes.In the same token, we can claim that each star in bonded locally to a center of mass that is integrated in the arm and it goes wherever the arm goes.
Quote from: Dave Lev on Yesterday at 05:32:39What kind of force can keep spiral arms in their spiral structure for so long time except of gravity force?I'm not aware of any astrophysicists who claimed that it wasn't gravity that held the arms together.
"The scientific theoretical model and the computational data output were developed by Drs. Brant Robertson and Lars Hernquist. AVL rendered more than 80 gigabytes of this data using in-house rendering software and Virtual Director for camera choreography."Do you trust this work by Drs. Brant Robertson and Lars Hernquist?
1. The Orion arm is a gravitational arm.2. The Sun is interacted by gravity to the Orion and it would go with this arm wherever it goes.
So, you fully agree that gravity held the arms together.
You also confirmed that as long as the star is interacted by gravity to the arm, it would go with the arm wherever it goes:
Therefore, do you claim now that all the above is incorrect?
If it is correct, why do you refuse to agree that:Quote from: Dave Lev on 19/11/2022 19:24:271. The Orion arm is a gravitational arm.2. The Sun is interacted by gravity to the Orion and it would go with this arm wherever it goes.
Why do you insist that there is a need for dark matter gravity interaction with Sun, while it is 100% clear to all of us that the sun is interacted by gravity to the spiral arm?
Would you kindly explain what is the mission of this forum?
Do you need to protect the main stream concept even if you clearly understand that there is a fatal error in their theory?
You know, 500 Years ago the main stream concept was that the Earth is the center of the Universe.Anyone that dare to claim differently could lose his life.Now nobody is going to lose his life if he proves that there is a fatal error in the current mainstream.However, his tread would be closed.
Therefore, I want to thank you all (including Halc & Evan_au) for your excellent support that helped me to understand how gravitational spiral arm really works.
Now you are more than welcome to close the tread in order to protect the mainstream concept from a contradiction that had been proved as a real science.