On Saturday, 5 February 2022 at 07:40:27 UTC, Jan Panteltje wrote:
Too many disk galaxies than theory allows
https://www.sciencedaily.com/releases/2022/02/220204123542.htm
Summary:
The Standard Model of Cosmology describes how the universe came into being according to the view of most physicists.
Researchers have now studied the evolution of galaxies within this model, finding considerable discrepancies with actual observations.
Even MOND does not explain it all...
Although It doesn’t specify what MOND can’t do, an inverse linear function is
better than inverse square. Because it goes part way to taking into account what must actually affect rotation curves.
Which is for example: A star X that is 1/2 way out from galaxy center. Newtonian calculation has orbital speed using total galaxy mass in the calculation. Including mass that is actually located in the opposite direction from the galaxy center relative to star X
(below is cross section of disc)
CENTER——————-star X—————————edge of disc
Notice 1/2 stars at edge of disc should pull star X in the opposite
direction than the center. This error of Newton’s inverse law would account for the observation that stars at edge of disc rotate faster then predicted
by inverse square.
Maybe a better formula for calculating orbital speeds of a star in a galaxy would be to only include stellar mass inside the orbital path of the star. Using this sort of calculation would have Stars near center
having less mass pulling on their orbit (but are closer
to center of mass);And stars at edge have much more mass
pulling on its orbital path in the calculation but are farther away from center.
of mass. The result would be roughly equal orbital speeds for all stars. Don’t even need MOND.
--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)