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Unformatted text preview: regions to get isolated or change their characteristics. Two regions of slightly higher density might collide, for example, and the resultant shock might trigger collapse: An alternative might be that two sub-critically-sized clouds merge and thence form a body which has too large a density to prevent collapse. Whatever starts the collapse, as it gathers momentum it will tend to be self-sustaining, as the gravitational force is concentrated by the material moving towards a central point: this collapse gathers pace until a distinct central body is formed - this is the origin of the central star of the system. (Hence planetary system cosmogony is usually linked to stellar system creation.)...
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