Anomalous Gravitational Effects in the Universe
  Based on previously published alternative reflections on gravitation, additional conclusions concerning anomalous gravitational effects in the universe are derived. For systems with spherical mass distribution and high central density of the luminous matter, abnormal increases in the gravitational potential towards the centers of these systems are derived. These anomalous increases are calculated on the basis of the amount and distribution of the observed luminous matter. For spiral galaxies, the calculation yields the astonishing result that the anomalous part of the gravitational potential is not produced by the large mass of the spiral system but by the small mass of the central bulge. A noticeable anomalous increase can only be expected close to the center, e.g. in the innermost region with a diameter on the order of only 1 pc in a bulge with a radius of 500 pc. Experimental observations are cited reporting such anomalous gravitational effects in the four spherical systems considered: globular star clusters, the bulges of spiral galaxies, elliptical galaxies, and clusters of galaxies. Conventionally, on the basis of Newtonian Mechanics and the amount of luminous matter, these effects are unexpected. They are most commonly explained by assuming the existence of appropriate large black holes or a sufficient amount of dark matter. 
Johann Albers