This session aims at understanding deep interiors and atmospheres of solar system bodies and massive extra-solar planets, their associated internal processes and corresponding material behaviour at extreme pressures and temperatures. These will have important implications for structural models (e.g. location of layer boundaries), evolution scenarios (e.g. demixing phenomena, diffusion), and magnetic field generation (e.g. nonmetal-metal transitions). This session also bridges the geophysical knowledge of bodies in the Solar System to rocky exoplanets by considering the potentially observable signatures associated with geologically-active worlds. Potentially fruitful targets are molten or volcanically-active planets, where the atmosphere and interior are tightly coupled through the exchange of heat and mass.

The session will include solicited and contributed papers addressing observational, laboratory, and theoretical studies of matter under planetary interior conditions.

Included subtopics are:
(1) Ab initio simulations and laboratory studies for matter under extreme conditions
(2) Interior structure, composition, and evolution
(3) Equation of state, melting, and phase transformation at extreme states
(4) Volcanism and magma ocean modeling
(5) Novel observational signatures of active worlds

The past few years have witnessed great advances in the computational simulations of impacts in planetary systems. These advances have played fundamental roles in reshaping models of planet formation, especially the formation of terrestrial planets and their compositions. For instance, more accurate simulations of giant impacts have enabled terrestrial planet formation models to branch away from the traditional perfect-merging scenario and have placed them on the path to becoming quantitative (and, therefore, predictive). Also, recent ideas on the early instabilities in our solar system have opened a new pathway to adopting more realistic initial conditions for the formation of our terrestrial planets and the origin of their chemical compositions. Collectively all these advances have also paved the way for extending new models of terrestrial planet formation to other planetary systems. The goal of this session is to address the above-mentioned topics through a combination of invited and contributed talks (as well as poster presentations). We will be happy to receive and welcome abstracts for oral and poster contributions in all areas related to theoretical, observational and experimental studies of terrestrial planet formation in our solar system and extrasolar planets.

Shape, gravity field, orbit, tidal deformation, and rotation state are fundamental geodetic parameters of any planet, satellite, asteroid, or comet. Measurements of these parameters are prerequisites for e.g. spacecraft navigation and mapping from orbit, but also for modelling of the interior and evolution of the object. This session welcomes contributions from all aspects of planetary geodesy, including the relevant theories, observations and models.

Planetary accretion, giant collisions, core formation, magma-ocean crystallization and other important processes during the early days of the solar system set the stage for the long-term evolution of terrestrial planets. These early processes can happen simultaneously or in recurring stages, and are ultimately followed by progressive crustal growth, long-term mantle mixing/differentiation, core-mantle interaction, as well as inner-core crystallization. Indeed, the coupled early and long-term evolution shapes the present-day structure and thermal state of planetary interiors. We seek to gain a better understanding of the formation and evolution of terrestrial bodies by bringing together studies from geophysics, geodynamics, mineral physics, geochemistry, and petrology.
This session welcomes contributions focused on data analysis, modeling and experimental work that address the formation and evolution of terrestrial planets and moons in the Solar System, and around other stars.