In a recent theological discussion, I came to realize that there is a point in question regarding planet formation in the current model of the origins of the Solar System. The question itself is not theological, but has some theological ramifications. It goes like this: Planets are believed to have formed through accretion in a solar nebula of dust and gases. Planetoids swept through this dust cloud, accumulating material until they reached their present size and character. But, it is apparent that the mass of the dust particles and the mass of the planetoid (or planet) are quite different. Ye the orbital distance of a given body around its central star will be a function of the mass and orbital velocity of the body. So, as planetoids acquire mass, they must also experience a change in either velocity or distance from the central star. It seems to me that a change in orbital velocity will not occur spontaneously, so one would expect that, as the planetoids increased in mass, they would spiral into their host star. If the planetoids eventually reached a stable orbit, I would expect it to be highly eccentric. I cannot envision a scenario in which dust-cloud aggregation will result in a stable planetary system consisting of multiple, nearly-circular orbiting planets. What am I missing?