A5036490819- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- Stellar, planetary, and galactic studies
- Isotope Analysis in Ecology
- Geochemistry and Geologic Mapping
- Geotechnical Engineering and Soil Stabilization
- Spacecraft Design and Technology
- Historical and Architectural Studies
- earthquake and tectonic studies
- Meat and Animal Product Quality
- Laser-induced spectroscopy and plasma
- Methane Hydrates and Related Phenomena
- Mercury impact and mitigation studies
- Calibration and Measurement Techniques
- Ion-surface interactions and analysis
- Maritime and Coastal Archaeology
- Soil Mechanics and Vehicle Dynamics
- Space Science and Extraterrestrial Life
- Spacecraft and Cryogenic Technologies
- Historical Astronomy and Related Studies
- Scientific Measurement and Uncertainty Evaluation
University of Colorado Boulder
2018-2024
University of Colorado System
2021-2023
Lawrence Livermore National Laboratory
2016-2018
Planetary Science Institute
2016
University of California, Los Angeles
2016
University of Maryland, College Park
2011-2012
Orbital data indicate that the youngest volcanic units on Moon are basalt lavas in Oceanus Procellarum, a region with high levels of heat-producing elements potassium, thorium, and uranium. The Chang’e-5 mission collected samples these young lunar basalts returned them to Earth for laboratory analysis. We measure an age 1963 ± 57 million years determine their chemical mineralogical compositions. This constrains impact chronology inner Solar System thermal evolution Moon. There is no evidence...
Impact glasses found in lunar soils provide a possible window into the impact history of inner solar system. However, their use for precise reconstruction this is limited by an incomplete understanding physical mechanisms responsible origin and distribution relationships to local regional geology. Here, we report U-Pb isotopic dates chemical compositions from Chang'e-5 soil quantitative models melt formation ejection that account these glasses. The predominantly provenance indicated...
The metamorphic history of martian meteorite NWA 7034 suggests that the crustal dichotomy may have formed within 100 million years planetary formation.
The first visible-light studies of Earth-sized extrasolar planets will employ photometry or low-resolution spectroscopy. This work uses EPOCh medium-band filter between 350 and 950 nm obtained with the Deep Impact (DI) High Resolution Instrument (HRI) Earth, Moon, Mars in addition to previous full-disk observations other six solar system Titan analyze limitations using photometric colors characterize planets. We determined that HRI 350, 550, 850 filters are optimal for distinguishing Earth...
Endurance is a mission concept to explore and ultimately return samples from the Moon's largest oldest impact basin, South Pole-Aitken (SPA). SPA holds answers many outstanding planetary science questions, including earliest bombardment of Solar System evolution interior. would address these questions by traversing 2,000 kilometers across lunar farside, collecting samples, delivering those Artemis astronauts for Earth. was identified as highest priority strategic NASA's Lunar Discovery...
Abstract During impact events, zircons develop a wide range of shock metamorphic features that depend on the pressure and temperature conditions experienced by zircon. These vary with original distance from center whether zircon grains are incorporated into ejecta or remain within target crust. We have employed preserved in >4 Ga lunar separated Apollo 14 15 breccias soils order to gain insights histories these areas Moon. report microstructural characteristics 31 analyzed using electron...
Abstract Investigations of trapped melt inclusions in minerals can yield insights into the compositions and conditions parent magmas. These are particularly important for detrital grains like many lunar zircons found samples returned by Apollo missions. However, unlike their terrestrial counterparts, have potentially been exposed to billions years impact bombardment. Samples from structures shock experiments revealed that deformation during an event produces glass blebs mimic igneous both...
Abstract In 1972, Apollo 17 astronauts returned 170.4 kg of lunar material. Within 1 month their return, a subset those samples was specially curated with the forethought that future analytical techniques would offer new insight into formation and evolution Moon. Of interest in this work is sample 71036, basalt collected from rim Steno crater Taurus–Littrow Valley, which stored frozen processed released for study 50 years later. We report, first time, detailed mineralogy petrology 71036 its...
We demonstrate a new way of investigating the processing lunar surface (and other planetary regoliths) that combines XeS-XeN ages (based on uranium fission) in individual zircons with their xenon isotopic record solar wind and cosmic ray exposure. report first analyses (from Apollo 14 soil breccias samples). Parallel suite from Vredefort impact structure South Africa revealed agree well U-Pb systematics, suggesting diffusion kinetics lead zircon are similar pressure-temperature environment...
We are developing an in situ, rock-dating spectrometer for spaceflight called the Chemistry, Organics, and Dating EXperiment (CODEX). CODEX will measure Rb-Sr compositions determine ages of samples on Moon or Mars can be augmented to obtain Pb-Pb ages. Coupling measurements broadens suite that dated could provide tests concordance. Here we assess whether geochronologically meaningful data measured situ by tuning prototype acquire from a well-characterized specimens Earth, Moon, Mars. For...