Planetary collisions are integral mechanisms that both shape the final configuration of the solar system and modify planetary surfaces thereafter. This session is aimed at understanding planetary impact processes at all scales, from the cratering regime to the giant impact regime, in terms of shock processes, dynamical aspects, geochemical consequences, and cratering chronology. We also welcome the examination of competing hypotheses for the giant impact formation of terrestrial and outer solar system bodies. Naturally, advancing our understanding of impact phenomena requires a multidisciplinary approach, which includes (but it is not limited to) numerical modelling, laboratory-scale experiments, geologic and structural mapping, remote sensing, petrographic analysis of impact products, and isotopic and elemental geochemistry analysis. We welcome presentations across this broad range of study and particularly encourage work that bridges the gap between the investigative methods employed in studying planetary impact processes at all scales.