“Kepler’s forgotten ideas about symmetry help explain spiral galaxies without the need for dark matter – new research” https://theconversation.com/keplers-forg

“Kepler’s forgotten ideas about symmetry help explain spiral galaxies without the need for dark matter – new research” https://theconversation.com/keplers-forgotten-ideas-about-symmetry-help-explain-spiral-galaxies-without-the-need-for-dark-matter-new-research-121017 https://theconversation.com/keplers-forgotten-ideas-about-sy...