This process is posited to go through a transition at the isolation mass, which is calculated from the (*) Hill sphere.  
Alan Boss posited an "instability" mechanism for this process, which avoids the "meter-size barrier". One phase of this process has a rate that is proportional to to the Safronov number, which is an expression involving the ratio of the square of the escape velocity to the relative velocity. An early step in this process is the formation of a two-dimensional structure via the Goldreich-Ward mechanism. One theory of this process posits an initial "runaway" phase followed by a slower "oligarchic" phase. This process is posited to go through a transition at the isolation mass, which is calculated from the (*) Hill sphere.  This process is posited to have been followed by a migration and rearrangement in the Nice model, which was used to explain the Late Heavy Bombardment. This process takes on the order of 10 million years and begins with a circumstellar disk according to the nebular hypothesis. For 10 points, name this process by which bodies like Mars and Jupiter form.
Alan Boss posited an "instability" mechanism for this process, which avoids the "meter-size barrier".
planet formation [or solar system formation or common-language equivalents; anti-prompt on the formation of specific planets or moons]