Rotation curve of a spiral galaxy in the Ursa Major cluster (UMa). In the New General Catalogue of Nebulae and Clusters of Stars (NGC) [46] its number is 3769. The vertical axis is the velocity in km/sec, and the horizontal axis is the distance from the center of the galaxy in kpc. Dots with error bars are observations. Solid curve is fitting by empirical MOND (modified Newton’s dynamics) [37, 41]. Dashed line is Newton’s .