Re: Is the Sun mostly dark matter ?

Bob Remeaux wrote:
There is dark matter in the Sun, but the density of dark matter within the sun is not so much greater than the density across the solar system as a whole. This is in contrast to ordinary matter, where the sun represents the overwhelming majority of the mass of the solar system.

This is precisely the problem with Dark Matter! First you have to explain that somehow DM doesn't interact with either itself or with Regular Matter other than through gravity. If it starts falling into a star's gravity well, it will just slingshot out again since there is no force there to brake it. Yet how do you explain how it is braked by the gravity well of a galaxy any more than it is braked by gravity well of a star? What is different about the gravity well of a galaxy than the gravity well of a star or planet that allows DM to slow down and enter into orbit around it?

Also why does the DM only affect the stars of the outer galaxy, but not the inner galaxy? Why aren't the stars of the inner galaxy orbiting the centre of the galaxy faster because of the extra mass presented by the DM? These are all large picture questions, and DM advocates are guilty of not seeing the forest for the trees here.

Yousuf Khan
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Relevant Pages

  • johnreed Take 23 - Dark Matter
    ... us to propose a type of matter called the dark-matter. ... extreme conditions of pressure that are believed to exist within star ... Externally each atom ... against the idea for mass generated gravity. ...
    (sci.physics)
  • The Least Action Consistent Stable Universe and the Mathematics, Section 8, johnreed
    ... us to propose a type of matter called the dark-matter. ... extreme conditions of pressure that are believed to exist within star ... Externally each atom ... against the idea for mass generated gravity. ...
    (sci.physics.relativity)
  • The Least Action Consistent Stable Universe and the Mathematics, Section 8, johnreed
    ... us to propose a type of matter called the dark-matter. ... extreme conditions of pressure that are believed to exist within star ... Externally each atom ... against the idea for mass generated gravity. ...
    (sci.physics)
  • Re: Could Dark Matter be here on earth?
    ... difference between it and ordinary matter though? ... I'm asking why dark matter doesn't interact with ... A star is not some omnipotent vortex that sucks in all that it ... down gas molecules which then allows gravity to do its' thing. ...
    (sci.physics)
  • Re: Is the Sun mostly dark matter ?
    ... This is in contrast to ordinary matter, where the sun represents the overwhelming majority of the mass of the solar system. ... First you have to explain that somehow DM doesn't interact with either itself or with Regular Matter other than through gravity. ... It's the total energy that determines whether DM is constrained or not, and the 'gravity well' of a galaxy is more than that of a star, so DM is more bound to galaxies than stars. ...
    (sci.physics)