In this session, we will share diverse approaches and ideas exploring the evolutionary pathways of terrestrial planets as complex systems. Their evolution is dependent on a wide array of different mechanisms and how they interact together. Based on present-day observation of examples within our Solar System, and simulations, we wish to foster discussion of models of planetary development: is there a general evolution pattern or is the process stochastic? The aim of this session is also to emphasize the importance of coupling between different layers of the terrestrial planets and feedback processes. Those are still often under-explored and have potentially major repercussions on planetary evolution. For example, surface conditions are dependent on atmosphere composition, which results from early and on-going degassing, atmospheric losses and chemistry, and chemical reactions with the surface. In turn, surface conditions can affect the habitability of the planet. Changes in surface temperature affect surface alteration processes as well as volatile exchanges and might even govern the tectonic regime.
We welcome contributions focused on a single terrestrial body as well as from comparative planetology. Both solar system bodies and exoplanets studies are covered. This session will bring together scientists from a wide range of domains, with a multi-disciplinary outlook, and examine how they can affect planetary evolution. Targeted disciplines include planetary structure and composition, mantle dynamics, tectonic regimes, geomagnetism, volcanism, surface interaction/erosion, geochemistry, petrology, remote sensing, structural geology, atmospheric sciences, volatile cycling, climate and habitability.

The Open Session on Moon, Mars, Mercury, Venus as terrestrial planets systems aims at presenting highlights of relevant recent results through observations, modelling, laboratory and theory. Key research questions concerning the surface, subsurface, interior and their evolution will be discussed, as well as instruments and techniques from Earth and space.

InSight landed on Mars on November 26th, 2018, bringing the first geophysical observatory to the surface of Mars. It attempts to constrain the interior structure of the planet and identify key physical processes that have shaped its evolution. At the time of the meeting, the instruments have been operating at full capacity for 14 months, or about half a Martian year. This session invites contributions from numerical modeling, experimental studies and data processing from various disciplines such as but not limited to geophysics, geology and geochemistry that aim to evaluate, interpret and complement the seismic and heat flow measurements, as well as rotational state, magnetic and atmospheric data of the InSight mission.
This interdisciplinary session will gather together results welcoming all research, whether part of the mission team or not.

Public information:
Additionally, a webcast will be held on Monday, May 4, 20:00 CEST (11:00 PST) to present the current status and scientific results of the InSight mission.

Join the webcast at
https://ethz.zoom.us/j/99691510985
Meeting-ID: 996 9151 0985

We welcome general contributions in exoplanetary science including detection, characterisation and numerical modelling studies. We particularly welcome cross-disciplinary contributions involving interior-atmosphere, surface-geology, biogeochemistry, stellar-planetary interactions, high energy astro-particles, escape and plasma physics. We further welcome contributions on the climate, composition and interior of Mini Gas Planets and rocky exoplanets including Super-Earths, Earth-like and Venus-like worlds and their timescales of potential habitability.