Figure 6

From left to right : the first \(\pmb{{\simeq}10\mbox { yr}}\) of the evolution of the protostellar system that forms at the center of four different minihalos. In all cases, a disk forms that becomes gravitationally unstable and fragments into a small system of protostars. Complicated gravitational torques result in a fraction of the protostars migrating to the center of the cloud, where they merge with the primary protostar, while others migrate to higher orbits. Adapted from Greif et al. (2012).