Explanipedia

A Theoretical Study of Carbon Nanotube Formation: Carriers of the Diffuse Interstellar Bands? Open

Abhishek Kumar Thakur, Patrick J. Lohr, Jacob Bernal, Abu Asaduzzaman, Krishna Muralidharan , et al. · 2025

Density functional theory (DFT) calculations have been conducted to probe the formation of carbon nanotubes (CNTs) from graphitic sheets in the presence of a simulated circumstellar shock wave. The sheets serve as a model for graphite laye…

The variety and origin of materials accreted by Bennu’s parent asteroid Open

Jessica Barnes, A. N. Nguyen, F. A. J. Abernethy, Ken‐ichi Bajo, David V. Bekaert , et al. · 2025

The first bodies to form in the Solar System acquired their materials from stars, the presolar molecular cloud and the protoplanetary disk. Asteroids that have not undergone planetary differentiation retain evidence of these primary accret…

Mineralogical evidence for hydrothermal alteration of Bennu samples Open

T. J. Zega, T. J. McCoy, S. S. Russell, L. P. Keller, Z. Gainsforth , et al. · 2025

Sulfide minerals bear witness to impacts across the solar system Open

M. S. Thompson, J. Davidson, D. L. Schrader, T. J. Zega · 2025

Na,Ca carbonates in OSIRIS-REx samples: Evidence for low-temperature, Na-bearing brines on Bennu’s parent body Open

S. A. Singerling, Frank E. Brenker, B. J. Tkalcec, S. S. Russell, T. J. Zega , et al. · 2025

An overview of the petrography and petrology of particles from aggregate sample from asteroid Bennu Open

H. C. Connolly, D. S. Lauretta, T. J. McCoy, S. S. Russell, Pierre Haenecour , et al. · 2025

The OSIRIS‐REx mission returned a sample of regolith from the carbonaceous asteroid Bennu in September 2023. We present preliminary in situ investigations of the petrology and petrography of selected particles ranging in size from 0.5 to 3…

An evaporite sequence from ancient brine recorded in Bennu samples Open

T. J. McCoy, S. S. Russell, T. J. Zega, K. L. Thomas-Keprta, S. A. Singerling , et al. · 2025

Tarda and Tagish Lake: Samples from the same outer Solar System asteroid and implications for D- and P-type asteroids Open

D. L. Schrader, E. A. Cloutis, D. M. Applin, J. Davidson, Z. A. Torrano , et al. · 2024

Asteroid (101955) Bennu in the laboratory: Properties of the sample collected by OSIRIS‐REx Open

D. S. Lauretta, H. C. Connolly, Joseph E. Aebersold, C. M. O'd. Alexander, Ronald‐L. Ballouz , et al. · 2024

On September 24, 2023, NASA's OSIRIS‐REx mission dropped a capsule to Earth containing ~120 g of pristine carbonaceous regolith from Bennu. We describe the delivery and initial allocation of this asteroid sample and introduce its bulk phys…

Incipient space weathering on asteroid 162173 Ryugu recorded by pyrrhotite Open

Dennis Harries, Toru Matsumoto, F. Langenhorst, T. Noguchi, Akira Miyake , et al. · 2024

Regolith samples returned from asteroid 162173 Ryugu by the Hayabusa2 mission provide direct means to study how space weathering operates on the surfaces of hydrous asteroids. The mechanisms of space weathering, its effects on mineral surf…

Asteroid (101955) Bennu in the Laboratory: Properties of the Sample Collected by OSIRIS-REx Open

D. S. Lauretta, Jr. Connolly, Joseph E. Aebersold, C. M. O'd. Alexander, Ronald‐L. Ballouz , et al. · 2024

On 24 September 2023, the NASA OSIRIS-REx mission dropped a capsule to Earth containing approximately 120 g of pristine carbonaceous regolith from Bennu. We describe the delivery and initial allocation of this asteroid sample and introduce…

In situ investigation of an organic micro‐globule and its mineralogical context within a Ryugu “sand” grain Open

Van T. H. Phan, Pierre Beck, Rolando Rebois, É. Quirico, T. Noguchi , et al. · 2024

The Hayabusa2 mission from the Japan Aerospace Exploration Agency (JAXA) returned to the Earth samples of carbonaceous asteroid (162173) Ryugu. This mission offers a unique opportunity to investigate in the laboratory samples from a C‐type…

Four‐dimensional‐STEM analysis of the phyllosilicate‐rich matrix of Ryugu samples Open

Bahae‐Eddine Mouloud, Damien Jacob, Francisco de la Peña, Maya Marinova, Corentin Le Guillou , et al. · 2024

Ryugu asteroid grains brought back to the Earth by the Hayabusa2 space mission are pristine samples containing hydrated minerals and organic compounds. Here, we investigate the mineralogy of their phyllosilicate‐rich matrix with four‐dimen…

Influx of nitrogen-rich material from the outer Solar System indicated by iron nitride in Ryugu samples Open

Toru Matsumoto, T. Noguchi, Akira Miyake, Yohei Igami, Mitsutaka Haruta , et al. · 2023

Mineralogy and petrology of fine‐grained samples recovered from the asteroid (162173) Ryugu Open

T. Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta , et al. · 2023

Samples returned from the carbonaceous asteroid (162173) Ryugu by the Hayabusa2 mission revealed that Ryugu is composed of materials consistent with CI chondrites and some types of space weathering. We report detailed mineralogy of the fin…

Phyllosilicates with embedded Fe‐based nanophases in Ryugu and Orgueil Open

Hugues Leroux, Corentin Le Guillou, Maya Marinova, Sylvain Laforet, Jean‐Christophe Viennet , et al. · 2023

Samples were recently collected from the carbonaceous asteroid (162173) Ryugu, by the Japan Aerospace Exploration Agency (JAXA) Hayabusa2 mission. They resemble CI chondrites material, thus showing clear evidence of extensive aqueous alter…

Volatiles, vesicles, and vugs: Unraveling the magmatic and eruptive histories of Steno crater basalts Open

Z. E. Wilbur, Jessica Barnes, S. A. Eckley, I. J. Ong, Maryjo Brounce , et al. · 2023

In 1972, Apollo 17 astronauts returned 170.4 kg of lunar material. Within 1 month of their return, a subset of those samples was specially curated with the forethought that future analytical techniques would offer new insight into the form…

Re-distribution of volatiles on the airless surface of the C-type carbonaceous asteroid Ryugu. Open

Toru Matsumoto, T. Noguchi, Akira Miyake, Yohei Igami, Mitsutaka Haruta , et al. · 2023

Volatile components are abundant in carbonaceous asteroids and can be important tracers for the evolution of asteroid surfaces interacting with the space environment, but their behavior on airless surfaces is poorly understood. Samples fro…

Nonequilibrium spherulitic magnetite in the Ryugu samples Open

E. Dobrică, H. A. Ishii, J. P. Bradley, Kenta K. Ohtaki, A. J. Brearley , et al. · 2023

A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu Open

T. Noguchi, Toru Matsumoto, Akira Miyake, Yohei Igami, Mitsutaka Haruta , et al. · 2022

Without a protective atmosphere, space-exposed surfaces of airless Solar System bodies gradually experience an alteration in composition, structure and optical properties through a collective process called space weathering. The return of …

EXPERIMENTAL INSIGHTS INTO THE FORMATION OF INTERSTELLAR FULLERENES AND CARBON NANOTUBES Open

Jacob Bernal, L. M. Ziurys, T. J. Zega · 2022

Atomic-scale characterization of the oxidation state of Ti in meteoritic hibonite: Implications for early solar system thermodynamics Open

Pierre-Marie Zanetta, Venkateswara Rao Manga, Yao‐Jen Chang, Tarunika Ramprasad, Juliane Weber , et al. · 2022

Calcium-aluminum-rich inclusions (CAIs) in chondritic meteorites are composed of refractory minerals thought to be the first solids to have formed in the solar nebula. Among them, hibonite, nominally CaAl12O19, holds particular interest be…

Coordinated Analyses of a Supernova Silicate Grain in the CO3.0 Chondrite Miller Range 07687 Open

Laura Seifert, Pierre Haenecour, Tarunika Ramprasad, T. J. Zega · 2021

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Coordinated Analysis of a Metal-rich Nugget from a Calcium-aluminum-rich Inclusion. Open

Tarunika Ramprasad, Venkateshwara Manga, Laura Seifert, T. J. Zega · 2021

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The oxidation state of Ti in hibonite at the atomic scale Open

Pierre-Marie Zanetta, Yao‐Jen Chang, Tarunika Ramprasad, Venkat Manga, Juliane Weber , et al. · 2021

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Atomic-scale Evidence for Open-system Thermodynamics in the Early Solar Nebula Open

T. J. Zega, Venkat Manga, F. J. Ciesla, Krishna Muralidharan, Keitaro Watanabe , et al. · 2021

We report a new integrated framework that combines atomic-length-scale characterization via aberration-corrected scanning transmission electron microscopy with first-principles-driven thermodynamic modeling and dust-transport models to pro…

The Fe/S ratio of pyrrhotite group sulfides in chondrites: An indicator of oxidation and implications for return samples from asteroids Ryugu and Bennu Open

D. L. Schrader, J. Davidson, T. J. McCoy, T. J. Zega, S. S. Russell , et al. · 2021

3D Microstructural and Microanalytical Analyses of Wark-Lovering Rims in the Allende Meteorite Open

Juliane Weber, Tarunika Ramprasad, K. Domanik, Yao‐Jen Chang, T. J. Zega · 2020

Journal Article 3D Microstructural and Microanalytical Analyses of Wark-Lovering Rims in the Allende Meteorite Get access Juliane Weber, Juliane Weber University of Arizona, Tucson, Arizona, United States Search for other works by this aut…

Putting Planetary Materials into the Gap: Insights into Planetary and Stellar Processes from in Situ Measurements in the TEM Open

T. J. Zega · 2020

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Formation of Interstellar C60 from Silicon Carbide Circumstellar Grains Open

Jacob Bernal, Pierre Haenecour, Jane Y. Howe, T. J. Zega, S. Amari , et al. · 2019

We have conducted laboratory experiments with analog crystalline silicon carbide (SiC) grains using transmission electron microscopy (TEM) and electron energy-loss spectroscopy (EELS). The 3C polytype of SiC was used—the type commonly prod…

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