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About

S. Rheershemius is a planetary scientist whose work centers on understanding the thermal and physical evolution of terrestrial bodies, with a particular focus on Mars. Their most significant contribution is their central role in the development of the Heat Flow and Physical Properties Package (HP³) for NASA’s InSight mission. This instrument, detailed in their highly cited 2018 paper (146 citations), was designed to achieve a groundbreaking goal: the first direct measurement of Mars’ planetary heat flow. By aiming for an uncertainty of better than 5%, Rheershemius helped pioneer a technique to probe the planet’s internal heat budget from the Elysium Planitia landing site. This work is fundamental to constraining models of Mars’ thermal history, crustal thickness, and tectonic activity. Beyond this flagship achievement, their research has provided critical insights into the physical properties of planetary regolith and the design of instruments for extreme environments. With a citation count reflecting the foundational nature of their work, Rheershemius stands as a key figure in advancing our understanding of how rocky planets cool and evolve.