Galaxy orbital velocities explained without 'dark matter' halos.

Discussion in 'Pseudoscience' started by nebel, Dec 19, 2014.

  1. Hayden Registered Member

    It is not in dispute, observed fact, that the outer stars are moving at a faster speed than the Keplerian maths suggest.

    In an orbital motion, the orbital speed is determined by the central pull, so any higher speed observation would call for either new physics or increased mass. MOND explains but changes Newtonian Physics a bit, other option which is widely accepted is dark matter. The distribution profile of dark matter still remains a subject matter of further research.
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  3. nebel Valued Senior Member

    Keplerian math is based on a huge central mass, a star in a planetary system mostly void of matter, and galaxies of various configurations are far from that easy arrangement.
    In those cases of more even mass distribution, the shell theorems are more applicable and they show that here is more gravity on the outside than the inside every time. more gravity on the outside would show up in larger orbital velocity. For these small curvature outer orbits, acceleration by deviating from the tangent requires more distance travelled.
    It is just possible that dark matter might turn out to be a red herring.
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