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A Low Albedo, Thin, Resistant Unit in Oxia Planum, Mars: Evidence for an Airfall Deposit and Late-Stage Groundwater Activity at the ExoMars Rover Landing Site
Fawdon, P.; Grindrod, P. M.; Davis, J. M. +2 more
Oxia Planum, Mars, is the future landing site of the ExoMars Rosalind Franklin rover mission, which will search for preserved biosignatures in a phyllosilicate-bearing unit. Overlying the mission-important phyllosilicate-bearing rocks is a dark, capping unit—known here as the Low albedo, Thin, Resistant (LTR) unit—which may have protected the phyl…
Geostratigraphic Mapping of the Intrusive Valentine Domes on the Moon
Rossi, Angelo Pio; Suárez-Valencia, Javier Eduardo
Lunar intrusive igneous domes have not been the center of much research in the past due to their rare occurrence on the lunar surface, and the difficulty in locating them. Most of the known structures were discovered using images with low illumination angles, including data from the Lunar Orbiter, telescopic images, and photos taken during the Apo…
Comprehensive Analysis of a Chloride-Rich Topographic Depression in Terra Sirenum, Mars: A Possible Lost Basin With Astrobiological Significance
Singh, Deepali; Sinha, Rishitosh K.; Acharyya, Kinsuk
The hygroscopic nature of chlorides gives them the potential to provide a harbor for microbes to adapt and survive in extreme conditions, which is pertinent to Mars, given its evolution of climatic conditions. Moreover, observations of secondary hydrous minerals in chloride-rich regions have opened the case for a diverse geological environment on …
Observations of Water Frost on Mars With THEMIS: Application to the Presence of Brines and the Stability of (Sub)Surface Water Ice
Forget, F.; Piqueux, S.; Szantai, A. +4 more
Characterizing the exchange of water between the Martian atmosphere and the (sub)surface is a major challenge for understanding the mechanisms that regulate the water cycle. Here we present a new data set of water ice detected on the Martian surface with the Thermal Emission Imaging System (THEMIS). The detection is based on the correlation betwee…
Extensive Secondary Cratering From the InSight Sol 1034a Impact Event
Grindrod, P. M.; Daubar, I. J.; Collins, G. S. +10 more
Impact cratering is one of the fundamental processes throughout the history of the Solar System. The formation of new impact craters on planetary bodies has been observed with repeat images from orbiting satellites. However, the time gap between images is often large enough to preclude detailed analysis of smaller-scale features such as secondary …
Mg Exosphere of Mercury Observed by PHEBUS Onboard BepiColombo During Its Second and Third Swing-Bys
Korablev, O.; Chaufray, J. -Y.; Leblanc, F. +6 more
Mercury's exosphere is an important target for understanding the dynamics of coupled systems in space environments, tenuous planetary atmospheres, and planetary surfaces. Magnesium (Mg) is especially crucial for establishing methods for estimating the surface chemical composition distribution through observations of the exosphere because its distr…