You will get the horizontal rotation curve of spiral galaxies and the increasing rotation curve of small galaxies respectively by using the well-known features of normal baryonic matter. There is no need for any speculative matter or other unknown. INTRODUCTION. Rotation curve of solar system is decreasing corresponding to Kepler's law of planetary motion. Therefore the velocity of Jupiter is less than half of Earth's velocity. Observations of bright galaxies result in rather horizontal rotation curves. In contrast the rotation curves of less bright galaxies are increasing towards the edge. (Less brigh
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