«I had heard there was this trouble understanding the so -
called galactic rotation curves, which describe the way stars rotate around the centers of galaxies,» he says.
In 1983, Mordehai Milgrom a physicist at the Weizmann Institute of Science in Rehovot, Israel, found that he could explain the so -
called galaxy
rotation curves without dark matter if he simply assumed that on the
galactic scale, dynamics and gravity worked a bit differently from what Isaac Newton postulated.