A5023264421- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Space Science and Extraterrestrial Life
- Geological and Geochemical Analysis
- Marine and environmental studies
- Methane Hydrates and Related Phenomena
- Polar Research and Ecology
- Paleontology and Stratigraphy of Fossils
- Hydrocarbon exploration and reservoir analysis
- Spaceflight effects on biology
- Cryospheric studies and observations
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- Geomagnetism and Paleomagnetism Studies
- Space exploration and regulation
- Geological formations and processes
- Isotope Analysis in Ecology
- Geological Studies and Exploration
- Maritime and Coastal Archaeology
- Scientific Research and Discoveries
- High-pressure geophysics and materials
- Aeolian processes and effects
- Archaeology and ancient environmental studies
Brown University
2016-2025
Planetary Science Institute
2014-2025
Lancaster University
1993-2025
John Brown University
2012-2024
Providence College
2011-2024
Wesleyan University
2022
Institute for Space Astrophysics and Planetology
2022
Jet Propulsion Laboratory
1994-2021
MVJ Medical College and Research Hospital
2021
MVJ College of Engineering
2021
The search for water on the surface of anhydrous Moon had remained an unfulfilled quest 40 years. However, Mineralogy Mapper (M3) Chandrayaan-1 has recently detected absorption features near 2.8 to 3.0 micrometers Moon. For silicate bodies, such are typically attributed hydroxyl- and/or water-bearing materials. On Moon, feature is seen as a widely distributed that appears strongest at cooler high latitudes and several fresh feldspathic craters. general lack correlation this in sunlit M3 data...
Geological and physical observations constraints are applied to the development of a model ascent emplacement basaltic magma on earth moon. Mathematical models nature motion gas/liquid mixtures developed show that gas exsolution from terrestrial lunar magmas commonly only occurs at shallow depths (less than 2 km); thus bubble‐free depth can be treated separately complex motions caused by near surface. Magma is related dike or conduit width; lower limit width determined presence finite yield...
Topography and gravity measured by the Mars Global Surveyor have enabled determination of global crust upper mantle structure Mars. The planet displays two distinct crustal zones that do not correlate globally with geologic dichotomy: a region thins progressively from south to north encompasses much southern highlands Tharsis province approximately uniform thickness includes northern lowlands Arabia Terra. strength lithosphere beneath ancient suggests hemisphere was locus high heat flow...
The primary objective of the Mars Observer laser altimeter (MOLA) investigation is to determine globally topography at a level suitable for addressing problems in geology and geophysics. Secondary objectives are characterize 1064‐nm wavelength surface reflectivity contribute analyses global mineralogy seasonal albedo changes, assist atmospheric circulation, provide geodetic control topographic context assessment possible future landing sites. principal components MOLA diode‐pumped,...
A preliminary analysis of a global survey Magellan data covering over 90% the surface and designed to document characteristics, location, dimensions all major volcanic features on Venus has revealed 1660 landforms deposits. These include 550 shield fields (concentrations small volcanoes <20 km in diameter), 274 intermediate between 20 100 diameter with variety morphologies, 156 large excess diameter, 86 calderalike structures independent those associated typically 60–80 175 coronae...
Surface conditions on Mars are currently cold and dry, with water ice unstable the surface except near poles. However, geologically recent glacierlike landforms have been identified in tropics midlatitudes of Mars. The has proposed to originate from either a subsurface reservoir or atmosphere. We present high-resolution climate simulations performed model designed simulate present-day cycle but assuming 45 degrees obliquity as experienced by few million years ago. predicts accumulation...
It has been proposed that Jupiter's satellite Europa currently possesses a global subsurface ocean of liquid water. Galileo gravity data verify the is differentiated into an outer H 2 O layer about 100 km thick but cannot determine current physical state this (liquid or solid). Here we summarize geological evidence regarding extant ocean, concentrating on imaging data. We describe and assess nine pertinent lines evidence: impact morphologies, lenticulae, cryovolcanic features, pull‐apart...
High-resolution altimetric data define the detailed topography of northern lowlands Mars, and a range is consistent with hypothesis that lowland-encircling geologic contact represents ancient shoreline large standing body water present in middle Mars history. The altitude close to an equipotential line, smoother at all scales below than above it, volume enclosed by this within estimates available on series extensive terraces parallel many places.
Lunar volcanic deposits are dominated by areally extensive mare units occurring in regionally low areas predominantly on the lunar near side. Data obtained from orbit and earth‐based observations have been used to extend detailed characterizations derived Apollo Luna sample return missions other parts of moon. Mare volcanism occurred over a period about 1.3 billion years (b.y.), 3.8 2.5 b.y. ago, although absolute age youngest flows is not known. An early Ti‐rich phase (Apollo 11 17 type...
A committee of the Mars Exploration Program Analysis Group (MEPAG) has reviewed and updated description Special Regions on as places where terrestrial organisms might replicate (per COSPAR Planetary Protection Policy). This review update was conducted by an international team (SR-SAG2) drawn from both biological science exploration communities, focused understanding when could occur. The study applied recently available data about martian environments organisms, building a previous analysis...
The volcanic filling of the lunar maria, formation mascons, tectonic features mare regions, and thermal evolution lithosphere are all interlinked. To explore these processes for major mascon maria (Serenitatis, Humorum, Imbrium, Orientale, Crisium, Nectaris, Smythii, Grimaldi), we determine characteristics geometry in each region, distribution units flooding subsidence history basin, temporal relations between geologic units, effective lithospheric thickness as a function time implications...