A5012530100- Astro and Planetary Science
- Planetary Science and Exploration
- Space Exploration and Technology
- Stellar, planetary, and galactic studies
- Geology and Paleoclimatology Research
- Astronomy and Astrophysical Research
- History and Developments in Astronomy
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Space Science and Extraterrestrial Life
- Astronomical Observations and Instrumentation
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Isotope Analysis in Ecology
- Geological and Geochemical Analysis
- Spacecraft and Cryogenic Technologies
- Historical Astronomy and Related Studies
- Career Development and Diversity
- Astrophysical Phenomena and Observations
- Geomagnetism and Paleomagnetism Studies
- Methane Hydrates and Related Phenomena
- Marine and environmental studies
- Innovative Teaching Methods
- Diversity and Career in Medicine
Albion College
2016-2025
Planetary Science Institute
2021
University of Hawaiʻi at Mānoa
2021
Brown University
2021
Marshall Space Flight Center
2021
Southwest Research Institute
2021
Williams & Associates
2021
University of California, Los Angeles
2021
Lawrence Livermore National Laboratory
2003-2005
Rensselaer Polytechnic Institute
1998-2002
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...
Abstract Impact cratering is the dominant process for transporting material on Moon's surface. An impact transports both proximal (continuous ejecta) locally and distal ejecta (crater rays) to much larger distances. Quantifying relative importance of derived versus requires understandings lunar regolith evolution mixing materials across The Moon has distinctive albedo units darker mare basalt brighter highland materials, contacts between these are ideal settings examine this question....
Abstract Lunar impact glasses, formed during events when the regolith is quenched ejecta's ballistic flight, are small samples whose information can lead to important advances in studies of Moon. For example, they provide evidence that constrains both compositional evolution lunar crust and timing flux starting at ~4,000 million years ago. They abundant retain geochemical tells us where formed. Thus, details about areas Moon sampled not by Apollo or Luna missions meteorites. Additionally, as...
Research Article| December 01, 2023 Impact History of the Moon Barbara A. Cohen; Cohen NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA barbara.a.cohen@nasa.gov; Search for other works by this author on: GSW Google Scholar Carolyn H. van der Bogert; Bogert Institut für Planetologie, Westfälische Wilhelms–Universität, 48149 Münster, Germany vanderbogert@uni-muenster.de; William F. Bottke; Bottke Southwest Institute, Boulder, CO 80302, bottke@boulder.swri.edu; Natalie M. Curran;...
Lunar impact glasses, which are quenched melts produced during cratering events on the Moon, have potential to provide not only compositional information about both local and regional geology of Moon but also flux over time. We present in this paper results 73 new 40Ar/39Ar analyses well-characterized, inclusion-free lunar glasses demonstrate that size, shape, chemical composition, fraction radiogenic 40Ar retained, cosmic ray exposure (CRE) ages important for investigations these samples....
Research Article| December 01, 2023 Lunar Impact Features and Processes Gordon R. Osinski; Osinski Department of Earth Sciences, University Western Ontario, 1151 Richmond St., London, ON, N6A 5B7, CanadaInstitute for Space Exploration, CanadaCanadian Network, Canada gosinski@uwo.ca Search other works by this author on: GSW Google Scholar H. Jay Melosh; Melosh Jeff Andrews-Hanna; Andrews-Hanna Planetary Lab, Arizona, Tucson, AZ 85721, USA David Baker; Baker Geology, Geophysics Geochemistry...
Over 200 molecules have been detected in multiple extraterrestrial environments, including glycolaldehyde (C2(H2O)2, GLA), a two-carbon sugar precursor that has regions of the interstellar medium. Its recent situ detection on nucleus comet 67P/Churyumov-Gerasimenko and via remote observations comae others, provides tantalizing evidence it is common most (if not all) comets. Impact experiments conducted at Experimental Laboratory NASA's Johnson Space Center shown samples GLA mixed with...
The Wisconsin Ultraviolet Photo Polarimeter Experiment (WUPPE) flew twice as part of NASA's Astro Spacelab missions in 1990 December and 1995 March. A systematic survey the interstellar polarization ultraviolet was one main projects on both flights. program carefully crafted to (1) sample galactic plane uniformly practicable, (2) explore sight lines diverse chemical composition morphology, (3) measure shape UV through full range known wavelengths peak optical. We present here Astro-2 data...
Abstract The major‐ and minor‐element abundances were determined by electron microprobe in 1039 glasses from regoliths regolith breccias to define the compositional topology of lunar at Apollo 16 landing site central highlands Moon. While impact with chemical compositions similar local materials (i.e., rocks regoliths) are abundant, exotic transported other areas Moon) account for up ˜30% population. A higher proportion compositionally exotic, angular glass fragments exists when compared...
Abstract— Thirteen glasses from Apollo 17 regolith 71501,262 have been chemically analyzed by electron microprobe and isotopically dated with the 40 Ar/ 39 Ar dating method. We report here first isotopic age obtained for very low titanium (VLT) volcanic glasses, 3630 ± Ma. Twelve impact that span a wide compositional range found to record ages ranging 102 20 Ma 3740 50 The compositions of these show some produced events within region, whereas others appear be exotic landing site. As data...
Abstract The distributions of 40 Ar/ 39 Ar‐derived ages impact glass spherules in lunar regolith samples show an excess at <500 Ma relative to older ages. It has not been well understood whether this young reflects increase the recent flux or is due a bias samples. We developed model simulate production, transport, destruction, and sampling spherules. A modeled seen when either (1) simulated depth 10 cm, consistent with typical from which Apollo soil were taken, (2) occurrence ejecta...
Lunar impact glasses possess the unmodified refractory element ratios of original fused target materials at sites impacts. These are regolith developed on different terrains and local rock types. Almost 800 from Apollo 14 landing site have been analyzed by electron microprobe in this study. show significant variation hint existence multiple differing compositions near site. To test idea, we used Clementine color image data to construct iron titanium maps which a petrologic map an elemental...
Research Article| December 01, 2023 Lunar Surface Processes J.B. Plescia; Plescia Johns Hopkins University, Applied Physics Laboratory, Laurel, MDDepartment of Geology, University Maryland, College Park, MD jeffrey.plescia@jhuapl.edu Search for other works by this author on: GSW Google Scholar J. Cahill; Cahill B. Greenhagen; Greenhagen P. Hayne; Hayne Department Astrophysical & Planetary Sciences and Laboratory Atmospheric Space Physics, Colorado, Boulder, CO Mahanti; Mahanti Arizona State...
view Abstract Citations (36) References (55) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Astro-2 Observations of Interstellar Dust and Gas in the Large Magellanic Cloud Clayton, Geoffrey C. ; Green, J. Wolff, Michael Zellner, Nicolle E. B. Code, A. D. Davidsen, Arthur F. WUPPE Science Team HUT This paper presents first UV (1400-3200 A) polarimetry far-UV (950-1200 spectrophotometry ever obtained for reddened stars (LMC). We derive wavelength dependence...
The R Coronae Borealis (RCB) stars produce dust at irregular intervals, but the distribution of circumstellar material is not known. We report spectropolarimetry (R CrB) itself, obtained in a deep decline with Wisconsin-Indiana-Yale-NOAO telescope. continuum polarized ~1% red, rising to ~2% blue. There are significant polarization variations across emission lines. Na I D lines indicates that light from emission-line region scattered different angle stellar continuum. position almost constant...
We report the first ultraviolet spectropolarimetry of B[e] star HD 50138, obtained with Wisconsin Ultraviolet Photo-Polarimeter Experiment aboard Astro-2 Space Shuttle mission in 1995 March. The data cover spectral range 1500-3200 Å. Spectropolarimetry contemporaneously 3800-10,000 Å visual-to-near-IR region are presented as well. presence intrinsic polarization is detected from UV to near-IR. Strong evidence a thin gaseous disk around found. An almost flat wavelength dependence optical...
Abstract Geochronology is an indispensable tool for reconstructing the geologic history of planets, essential to understanding formation and evolution our solar system. Bombardment chronology bounds models system dynamics, as well timing volatile, organic, siderophile element delivery. Absolute ages magmatic products provide constraints on dynamics magma oceans crustal formation, longevity interior heat engines distinct mantle/crustal source regions. dating also relates habitability markers...
Albion College, a private, undergraduate-only, liberal arts college in Michigan, USA, has developed and implemented low-cost peer-mentoring programme that blends personal academic support to help students achieve success the introductory courses required for Physics Major or Dual-Degree Program Engineering. This enhanced mentoring provides much-needed assistance undergraduate master physics mathematics coursework, normalise struggle of learning hard material, accept their identity as...