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Thread: our motion in the MW

  1. #1
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    Default our motion in the MW



    nicely written good graphics!

    Determining Our Motion Through the Galaxy

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    Default Re: our motion in the MW

    This is a really neat and elegant trick, using the deficit of stars at zero angular momentum to determine the solar motion.....

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    Default Re: our motion in the MW

    Hello n_F_A,

    that's a very interesting approach!
    Have you anything to share about the tajectory of our solar system in the Galaxy. I have no update, just some aged reprints in my archive.

    Thanks for sharing, and sorry for my being lazy to search by myself,

    JG
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    Default Re: our motion in the MW

    Quote Originally Posted by j.gardavsky View Post
    that's a very interesting approach!
    Have you anything to share about the tajectory of our solar system in the Galaxy. I have no update, just some aged reprints in my archive.

    Thanks for sharing, and sorry for my being lazy to search by myself,
    I'm glad you asked actually. The simple Google search (orbit of Sun in Milky Way) revealed a huge amount of worthless disinformation! I decided to ease the search task by looking for images that seemed promisingly plausible. This is the one...

    ch19f18.0_0.jpg

    The disk star (yellow orbit) is characteristic of the Sun's orbit. Halo star orbits are green and bulge star orbits are red. The image is from a nice article on a New Mexico State U website:
    http://ganymede.nmsu.edu/tharriso/ast110/class21.html

    I won't entertain any questions about the so called "vortex" theory of solar motion or other mistaken ideas that are motivated by scripture concerns rather than observations and facts.

    It's breathtaking how much misinformation is out there.

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    Default Re: our motion in the MW

    Let me pick out one particularly obnoxious example for disapproval:

    sunpath_milkyway.jpg

    from

    Vortex motion: Viral video showing Sun’s motion through galaxy is wrong.

    The article from Slate criticizes the "helical" or "vortex" model correctly but then holds up this picture example as more correct. I can grant that it is more correct but it is just plain wrong!

    It shows the orbit of the Sun as closed. It isn't. Closed orbits are only possible under the conditions of the Kepler problem (Newtonian gravity, dominant central point mass, so force is as inverse square of distance, etc.). Because the mass of the galaxy is distributed the force on the solar system is not inverse square and the orbit CANNOT be closed. Closed orbits are only possible for very limited forms of the force law. In fact it was Kepler's ellipse that told Newton the force law had to be inverse square for a point.

    Everything is up for grabs (no closure of orbit) for more complicated mass distributions.

    I'd expect the author of the article should know better. Perhaps just dumbing down?

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    Default Re: our motion in the MW

    Thank you very much, n_F_A!

    The yellow wavy 'orbit' is looking really very interesting.
    Best,

    JG
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