As comic book guy might say, "Worst. Acronym. Ever." MoND refers to a theory in physics, especially cosmology and astrophysics, that suggests that there is no real need to posit "dark matter". The case for dark matter has always been that the amount of observable matter in galaxies is not enough to understand how fast galaxies rotate. Either our views of gravity or our views of mass must change to cover these rotations. MoND opts for changing the view of gravity, rather than postulating vast quantities of mass. Here is Sabine Hossenfelder's explanation of the point. https://backreaction.blogspot.com/?fbclid=IwAR0Eild3WJDSYbL1NjgSjMsmenRUf6wbPy9HQE7DEkIrfLnlxHbvzp0g9Xc Advocates of Modified Newtonian Dynamics propose changes of the Newtonian theory of gravity. Of course, the Einstein revolution did already modify Newton. The point though was that another differently-motivated modification will be necessary, and that scientists from six score ye...