In a Wild Twist, Physicists Have Revived an Alternative Theory of Gravity - ScienceAlert
Although most cosmologists agree there's something out there called 'dark matter', causing spiral galaxies to rotate faster than they should, even dark matter doesn't answer all the questions we need it to.
One alternative hypothesis to dark matter is called Modified Newtonian dynamics (MOND) or Milgromian dynamics framework.But this team found that the galaxy's spin was extremely slow – slow enough that not only did they not need dark matter to confirm the models, but the rotation curve of the galaxy also cast huge doubt on the MOND framework."The very low reported rotation speed of this galaxy is inconsistent with both MOND and the standard approach with dark matter," says University of St Andrews physicist and one of the researchers of the new paper, Hongsheng Zhao.As wild as MOND might be, with dark matter still elusive, and many other questions still to be answered, we need all the options we can get