Presolar Cloud Collapse and the Formation and Early Evolution of the Solar System

摘要: We review our current understanding of the formation and early evolution solar nebula, protoplanetary disk from which system formed. Astronomical collapse dense molecular cloud cores to form protostars is relatively advanced, compared processes planetary systems. Examples exist nearly all phases protostellar evolution, guiding validating theoretical models star process. observations suspected disks are beginning provide key insights into likely conditions within although usually only on much larger scales than regions where terrestrial giant planets The primary mechanism for driving leading finally system, still highly uncertain: Magnetic fields, gravitational torques, baroclinic instabilities among competing mechanisms. While discovery extrasolar gas has reinforced general belief that should be a widespread process, absence any undisputed evidence protoplanets in process makes it hard decide between mechanisms their formation. situation regarding even less constrained observationally, this improve tremendously next decade.