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Do you have an idea which kind of theories they have used to form this simulation?
Is it all realistic?
Actually at any other point of time in the simulation, we didn't get that "direct line" which is the most important feature in the real photo.
Could it be that they didn't take in their simulation the real impact of this tidal force?
Hence, do you agree that Tidal force is a key ellement in the formation of spiral galaxy?
Hence, it is not about a gravity impact between the real matter (stars) in each galaxy, but between each star to the dark matter in the galaxy.
How do they know the real impact on the dark matter during this collision?
Why they assume that while stars are ejected outwards from the galaxies, the combined dark matter would move to the center of the galaxies?
I mean the impact due to dark matter
in our current understanding each star is connected by gravity to the center of its galaxy by the dark matter?
Do you confirm that based on our current understanding each star is connected by gravity to the center of its galaxy by the dark matter?
Quote from: Dave Levin our current understanding each star is connected by gravity to the center of its galaxy by the dark matter?Our star is connected to the supermassive black hole in the center of our galaxy by the mutual gravitation of the Sun and the supermassive black hole
If you want one that looks more like that, take a look at this simulation:The time between 0:31 to 0:34 has the galaxies connected by a straight line of gas and stars.
1.In the simulation we see that those two massive galaxies collide which each other while their galactic disc is fully aligned with each other. What is the chance for that?
Therefore, don't you agree that this arm is all about stars that are connected/bonded to each other by gravity.
Hence, why do you refuse to accept the simple idea that the bright line that we see in Nasa Photo is all about stars (or cluster of stars) that are connected to each other by gravity?
Gravity most certainly is an important factor in the shape of the arm.
Quote from: Dave Lev on 18/11/2022 09:03:06Therefore, don't you agree that this arm is all about stars that are connected/bonded to each other by gravity.Gravity most certainly is an important factor in the shape of the arm.Quote from: Dave Lev on 18/11/2022 09:03:06Hence, why do you refuse to accept the simple idea that the bright line that we see in Nasa Photo is all about stars (or cluster of stars) that are connected to each other by gravity?I'm not refusing it. I acknowledge that gravity plays an important role here.
I really appreciate that you are willing to accept the idea that the arm which is connected between the two galaxies is all about Gravitational arm where stars and gas clouds are connected to each other by gravity.
Quote from: Dave Lev on 18/11/2022 19:32:23I really appreciate that you are willing to accept the idea that the arm which is connected between the two galaxies is all about Gravitational arm where stars and gas clouds are connected to each other by gravity.I guess that depends on what you mean when you say "all about".
I mean that each star in that gravitational arm bridge holds itself by gravity force to the other stars in the arm
Quote from: Dave Lev on 18/11/2022 19:49:02I mean that each star in that gravitational arm bridge holds itself by gravity force to the other stars in the armIn a sense... but it's not like some sturdy structure like the steel beams that hold a building up. The distances between those stars are constantly changing. This arm is dynamic, unstable, and will eventually lose its current form.
So what is it about contemporary science that you are disputing here? I assume you put this into "New Theories" for a reason.
Why they assume that dark matter would move in the expected direction and density?
Please let me know if I understand correctly the current main stream explanation:
The Sun motion is affected by two kinds of gravity forces at the same time.
The gravity due to dark matter that holds it in its orbital motion around the galactic center.
Quote from: Dave Lev on 17/11/2022 15:47:37Do you confirm that based on our current understanding each star is connected by gravity to the center of its galaxy by the dark matter?The word 'connected' implies a physical EM connection like bars and strings and such, stuff of which objects of varying degree of rigidity are made. Stars are not connected in this way. They instead interact via gravity. All matter attracts all other matter as described by F=GMm/r². That's it.
The word 'connected' implies a physical EM connection like bars and strings and such
Quote from: Deve Levwould you agree that an object on Earth should fall upward to the moon due to gravity?Yes, it does - it is called a "tide".- But the gravitational force of the Moon (1/80 the mass of the Earth, at a distance of almost 400,000km)- Is much less than the gravitational force of the Earth (at a distance of 6,300km)- So the ocean tide is pretty small (typically 1 or 2 meters around here)- And there is an equivalent tidal force on the far side of the Earth
would you agree that an object on Earth should fall upward to the moon due to gravity?
Watch the video Origin posted. At 0:16, it looks a lot like that galaxy pair you posted. Then just watch the video from there to see what happens.
3. If we focus on the free arm of each galaxy, in this simulation it took it almost from 014 till 0:44 (30 sec = 720M years) to complete only one orbital cycle.
it was expected to get a spherical shape
What 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.
So do you confirm that each star in the spiral arm is interacted with the other stars in the arm by gravity force and goes together wherever the arm goes?
Quote from: Dave Lev on 19/11/2022 06:00:45So do you confirm that each star in the spiral arm is interacted with the other stars in the arm by gravity force and goes together wherever the arm goes?Only to an extent. If you watch the simulation, those stars don't form an arm indefinitely, so those stars definitely aren't staying together long-term.
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.