This conference brings together international specialists in petrology, geochemistry, geophysics, geology, and astronomy to present the latest results of research in planetary science. This year's special sessions are: Large Igneous Provinces in the Solar System; IODP-ICDP Expedition 364 to the Chicxulub Impact Crater; Mars Volatile Surface-Atmospheric Interactions: Past and Present.Program committee co-chairs David Draper, NASA Johnson Space Center Walter Kiefer, Lunar and Planetary Institute. Program committee co-chairs David Draper, NASA Johnson Space Center Walter Kiefer, Lunar and Planetary Institute.PARTIAL CONTENTS: Mars Seasonal Cap Edges and CO2 Ice Column Density--Widespread Low-Latitude Diurnal CO2 Frost on Mars--Global Patterns ...