Understanding why planetary atmospheres look the way they do today - and reconstructing the evolutionary pathways that brought them to their present states - is one of the most compelling questions in modern planetary science. This session adopts a comparative planetology perspective, bridging solar system bodies and exoplanet populations through the lens of atmospheric evolution, investigated through observations, modelling, and mission-driven science.
Space missions have delivered a wealth of observations of the atmospheres and aeronomy of rocky planets and moons, from the lower atmosphere to regions interacting directly with the solar wind. With recent advances and forthcoming missions, planetary atmospheric science is entering a particularly active phase. This session invites contributions on the physical and chemical processes shaping the lower, middle, and upper atmospheres of terrestrial bodies in the Solar System and beyond, including atmospheric chemistry, energetics, dynamics, electrodynamics, atmospheric escape, surface–atmosphere interactions, and coupling with the space environment. We welcome studies based on spacecrafts (e.g., Messenger, BepiColombo, Venus Express, Akatsuki, EnVision, Davinci, Mars Express, MRO, TGO, EMM, MAVEN, MMX, among others), ground-based observations, numerical modelling, and laboratory experiments.
We welcome contributions addressing the long-term evolution of atmospheres across all planetary types. In the inner solar system, Venus and Mars stand as striking cases of evolutionary divergence from Earth. In view of upcoming ESA and NASA Venus missions, contributions addressing current understanding, open questions, and preparatory studies of the Venus atmosphere and its long-term history are particularly encouraged, from photochemistry and cloud dynamics to the transformative science expected from ESA's EnVision (and its VenSpec suite) and DAVINCI.
In the outer solar system, Titan's organic-rich and seasonally evolving atmosphere offers a unique window into photochemical complexity and long-term change, with new observational and modelling efforts building on the Cassini legacy. The gas and ice giants - characterized with unprecedented detail by JWST, Juno, and the forthcoming JUICE mission - further enrich this comparative picture; ice giant atmospheres in particular represent a frontier for solar system science and an archetype for the most abundant planetary class in the galaxy, with the scientific case for a Uranus mission gaining momentum under NASA's Decadal Survey and ESA's Voyage 2050 framework.
Finally, broader comparative studies linking solar system atmospheric structure and chemistry to the growing population of exoplanets accessible to spectroscopic characterization are warmly welcomed. This includes contributions on atmospheric escape and its demographic imprints on exoplanet populations - from the radius valley and the Neptune desert to observations of young systems caught in the act of losing their envelopes. Both observational and modelling contributions are welcome, as well as cross-disciplinary studies connecting solar system and exoplanet atmospheric science through laboratory measurements, modeling and/or observations.
The session will include solicited and contributed oral presentations, as well as posters.

Planetary materials across the Solar System present a huge diversity in physical (grain size, roughness etc.) and chemical properties (composition, mineralogy, volatile/refractory content, organic/inorganic compounds) or even change of status (liquid, solid and gas).

Laboratory work on cosmo-materials either fallen on earth, returned by space missions or synthetically produced are essential for the understanding of the history of planets, moons, and small bodies. The results of controlled experiments are essential for the interpretations of measurements obtained by ground-based and space observations as well as exploration missions. They are also necessary for planning and preparing future in situ and sample-return space missions, ensuring their success in collecting valuable samples and data.

In this session, we invite submissions related to the analysis of cosmo-materials and to the production, evolution and analysis of planetary, moons and small bodies analogues (interpretation of chemical/physical properties, predictions, preparation of analytical tools or space instruments, preparation of analytical chain for sample return analyses, etc.). Laboratory experiments necessary to interpret data of any past, present and future space missions will be particularly encouraged.

Every modern scientist will, at one time or another, face the challenge of growing a community around their project, and give it an identity easily recognisable by the said-community. Whether a small research group or an international organisation, building proactive community may be the key to unlocking greater collaboration and scientific achievement.

In this session, we will explore key tools for community-building. We welcome contributions from all occupations and backgrounds in planetary science. Early-career scientists are especially encouraged to attend - the sooner we learn these skills, the more time we have to use them.

What should you expect from this session? And how can you contribute?

- Building identity: branding, visual identity (e.g., logo, motto, etc.) online, as well as at events and in the media: how do you make your brand recognisable?
- Social media presence, exchange tools and websites: how do you grow your online community?
- Community-building tips and tricks: what works and what doesn't?
- Networking and lobbying for your community: how can you find key stakeholders to support your project?
- Diversity and inclusion: how do we ensure our projects benefit from diverse participation, while circumventing inter-cultural tensions?
- Involving the public in research: how can your community-building effort can benefit from Citizen Science and Pro-Amateur collaborations?

Saturn's moon Titan, despite its satellite status, has nothing to envy the planets: it has planetary dimensions, a substantial and dynamic atmosphere, a carbon cycle, a variety of geological features (dunes, lakes, rivers, mountains and more), seasons, and a potential hidden ocean. It even now has its own mission: Dragonfly, selected by NASA in the frame of the New Frontiers program. In this session, scientific presentations are solicited to cover all aspects of current research on Titan: from its interior to its upper atmosphere, using data collected from the Cassini-Huygens mission (2004-2017) and/or from telescopes (e.g., ALMA, JWST) and/or based on modelling and experimental efforts to support the interpretation of past and future observations of this unique world.

The aim of this session is to provide a platform for all aspects related to instrumentation deployed on planetary (solid or liquid) surfaces. The conveners welcome contributions on hard/soft landers and atmospheric entry probes on missions past, present and future: outcomes, lessons learned and new developments. Equal emphasis is on development studies, models and laboratory tests of the next generation of in-situ instrumentation for planetary exploration.

The exploration of the surface and subsurface structure of planetary bodies is of utmost importance for reconstructing their formation and evolution processes. The goal of this session is to bring together scientists, mission and instrumentation developers and the observation community to discuss past, current or future investigations in this field.

We welcome contributions employing radar-based or spectroscopic techniques, including ground-penetrating radar, THz spectroscopy and related active or passive sensing methods to probe shallow to deep subsurface layers. Studies may address laboratory measurements, analogue studies, field campaigns, numerical modeling, instrument development, and data analysis from space missions, landed platforms, or remote observations.

Topics may include, but are not limited to: characterization of subsurface stratigraphy and heterogeneity, detection of volatiles, ice (cryosphere) and organic materials, porosity studies, and regolith studies of planets and small bodies such as asteroids, comets or moons.

Solar and planetary astronomy has always been a data-intensive science, and new observatories and spacecraft are gathering data at an unprecedented scale. However, to maximize the scientific return on this investment, researchers need access to an infrastructure that provides open access to data, correlative data, and common standards for communication and information exchange between repositories. Initiatives like NASA's Planetary Data Ecosystem, Europlanet/VESPA, ESA Datalabs, and NASA's Helio-Cloud are taking the first steps toward building such an infrastructure. We invite contributions showcasing open science opportunities and accomplishments in Heliophysics and Planetary science that highlight one or more of these capabilities, particularly those involving international standards such as IVOA, OGC, IPDA, and IHDEA.

The goal of this session is to cover numerical simulations, artificial intelligence techniques and relevant laboratory investigations related to the Small Bodies (comets, KBOs, rings, asteroids, meteorites, dust), their formation and evolution, and the instruments of their exploration. This session is specially focused on the interdisciplinary approach in the development of models (formal descriptions of physical phenomena), experiments (on ground and in micro-gravity), artificial intelligence techniques (particularly machine learning) and mathematical simulations (computational methods and algorithms of solution) of various astrophysical phenomena: (i) dusty gas cometary atmospheres; (ii) volcanic activity on icy satellites (e.g. Enceladus and Io); (iii) planetary body formation (e.g. via pebbles growth), and planetesimal dynamics.

This session will include an introduction and discussion of new and/or existing laboratory studies in simulated space-like environments and models, experimental techniques, computational methods that can address the results of analytical, experimental and numerical analysis (with respect to computational methods and algorithms of solution) on the above described studies.

Abstracts on thermophysical evolution models of small bodies interiors as well as on the modeling of atmosphere and exosphere are welcome.