Radio science has been used by many missions as a tool to study solar system phenomena and fundamental physics. The scope of this session includes radio, laser and optical science techniques to study ocean worlds, planetary and small body interiors, the dynamics, composition, and thermal structure of planetary atmospheres, to characterize the topography, scattering, electrical, and other properties of planetary surfaces, to study solar system dynamics and test fundamental physics, and to new techniques to combine diverse datasets. Radio science investigations motivated by U.S. Planetary Science Decadal Survey white papers are of particular interest. Relevant technology topics include but are not limited to the design of small spacecraft networks and constellations, the use of inter-satellite links, advances in flight and ground instrumentation, advances in space clock technologies, novel communications architectures including optical links, advances in radio and laser technologies, and new techniques and instrumentation for entry probes.