Fundamental data on planetary materials under extreme conditions are required to establish physics-based models of planetary interiors and impact events. Dynamic compression experiments provide a means of studying material properties under the conditions of planetary interiors. Experimental shock wave studies also present a unique capability to study impact phenomena in real time, providing insight into hypervelocity collisions relevant to planetary formation and evolution. Recent experimental developments have extended the types of measurements that are possible during the nanosecond to microsecond duration of shock experiments – opening entirely new lines of inquiry. New facilities that couple dynamic compression platforms with high-flux X-ray sources have allowed for in situ X-ray diffraction under dynamic loading. Such experiments can address a range of longstanding questions, including the following: What crystallographic phases are stable under what conditions? What is their thermoelastic behavior? When do they melt or vaporize? And what phases will form on release? Answers to these questions and others will provide input for next-generation models of the structure, dynamics, and evolution of planetary interiors as well and natural impact processes.