Assertion: star's velocity | /r/HasProperty | determined by many factors
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Source sentences:
text: The shape of the orbits and the velocity with which the celestial body moves along the orbit are determined by many factors, examples of which are the force of gravity, the force of light pressure, electromagnetic forces, the resistance of the medium in which the motion occurs, tidal forces, and, in the case of the motion of the nucleus of a comet, reactive forces.