PrefaceCedric Schmelzbach1. Introduction to special issueAmir Khan2. Seismology of the Solar SystemSimon C. Stähler and Martin Knapmeyer3. Planetary Core Radii: From Plato towards PLATOMartin Knapmeyer and Michaela Walterova4. Interior Dynamics and Thermal Evolution of Mars - a Geodynamic PerspectiveAna-Catalina Plesa, Mark A. Wieczorek, Martin Knapmeyer, Michaela Walterova, Doris Breuer and Attilio Rivoldini5 Tidal insights into rocky and icy bodies: An introduction and overviewAmirhossein Bagheri, Ana-Catalina Plesa, Michaela Walterova, Amir Khan, Michael Efroimsky, Julie Castillo-Rogez, Domenico Giardini, Sander Goossens, Nicolas Rambaux and Alyssa Rhoden