Explanipedia

Micrometeorite collections: a review and their current status Open

Matthias Van Ginneken, P. J. Wozniakiewicz, D. E. Brownlee, Vinciane Debaille, Vincenzo Della Corte , et al. · 2024

Micrometeorites are estimated to represent the main part of the present flux of extraterrestrial matter found on the Earth’s surface and provide valuable samples to probe the interplanetary medium. Here, we describe large and representativ…

Formation and evolution of carbonaceous asteroid Ryugu: Direct evidence from returned samples Open

Tomoki Nakamura, Megumi Matsumoto, Kana Amano, Yuma Enokido, M. E. Zolensky , et al. · 2022

Geology Physics

Samples of the carbonaceous asteroid Ryugu were brought to Earth by the Hayabusa2 spacecraft. We analyzed 17 Ryugu samples measuring 1 to 8 millimeters. Carbon dioxide–bearing water inclusions are present within a pyrrhotite crystal, indic…

Sampling interplanetary dust from Antarctic air Open

Sarah Taylor, J. Lever, Katherine Burgess, Richard C. Stroud, D. E. Brownlee , et al. · 2022

Environmental science Physics Materials science

We built a collector to filter interplanetary dust particles (IDPs) larger than 5 µm from the clean air at the Amundsen Scott South Pole station. Our sampling strategy used long duration, continuous dry filtering of near-surface air in pla…

Condensation and Radial Transport of Filamentary Enstatite Crystals from Interplanetary Dust Open

Kainen Utt, R. C. Ogliore, Nan Liu, Alexander N. Krot, J. P. Bradley , et al. · 2022

Physics Materials science

Filamentary enstatite crystals, formed by gas-solid condensation in the solar nebula, are found in chondritic porous interplanetary dust particles of probable cometary origin. We measured the oxygen isotopic composition of four filamentary…

Atmospheric CO <sub>2</sub> levels from 2.7 billion years ago inferred from micrometeorite oxidation Open

Owen Lehmer, David C. Catling, Roger Buick, D. E. Brownlee, Sarah Newport · 2020

Environmental science Geography Biology

Iron-rich micrometeorites from a 2.7 billion-year-old limestone could constrain atmospheric CO 2 levels on the early Earth.

Oxygen isotopic composition of an enstatite ribbon of probable cometary origin Open

R. C. Ogliore, D. E. Brownlee, K. Nagashima, D. J. Joswiak, J. B. Lewis , et al. · 2019

Geology Physics

Filamentary enstatite crystals are found in interplanetary dust particles (IDPs) of likely cometary origin but are very rare or absent in meteorites. Crystallographic characteristics of filamentary enstatites indicate that they condensed d…

Fine‐grained material associated with a large sulfide returned from Comet 81P/Wild 2 Open

Z. Gainsforth, A. J. Westphal, A. L. Butterworth, C. E. Jilly‐Rehak, D. E. Brownlee , et al. · 2019

Materials science Chemistry Geology

In a consortium analysis of a large particle captured from the coma of comet 81P/Wild 2 by the Stardust spacecraft, we report the discovery of a field of fine‐grained material (FGM) in contact with a large sulfide particle. The FGM was par…

Multiple generations of grain aggregation in different environments preceded solar system body formation Open

H. A. Ishii, J. P. Bradley, Hans A. Bechtel, D. E. Brownlee, Karen C. Bustillo , et al. · 2018

Materials science

Significance The initial solids from which the solar system formed consisted almost entirely of amorphous silicate, carbon, and ices. This dust was mostly destroyed and reworked by processes that led to the formation of planets. Surviving …

Supporting data CNO prior to corrections Open

H. A. Ishii, John L. Bradley, Hans A. Bechtel, D. E. Brownlee, Karen C. Bustillo , et al. · 2018

Chemistry Computer science

Table of data of carbon, nitrogen and oxygen elemental compositions prior to corrections. Supporting data for journal article published in Proceedings of the National Academy of Sciences in June 2018, titled "Multiple generations of grain …

The future of Stardust science Open

A. J. Westphal, J. C. Bridges, D. E. Brownlee, A. L. Butterworth, B. T. De Gregorio , et al. · 2017

Physics

Recent observations indicate that >99% of the small bodies in the solar system reside in its outer reaches—in the Kuiper Belt and Oort Cloud. Kuiper Belt bodies are probably the best‐preserved representatives of the icy planetesimals that …

Refractory materials in comet samples Open

D. J. Joswiak, D. E. Brownlee, A. N. Nguyen, S. Messenger · 2017

Geology Chemistry Physics

Transmission electron microscope examination of more than 250 fragments, >1 μm from comet Wild 2 and a giant cluster interplanetary dust particle ( GCP ) of probable cometary origin has revealed four new calcium‐aluminum‐rich inclusions ( …

Diversity of the initial rocky planetary building materials at the edge of the solar system Open

D. E. Brownlee, D. J. Joswiak · 2016

Geology Physics Sociology

Asteroids and comets are surviving members of the vast planetesimal population that was distributed across the early solar system. They appear to be a diverse set of bodies but we present evidence from comet samples that the body‐to‐body d…

Kepler Mission Design, Realized Photometric Performance, and Early Science Open

David Koch, W. J. Borucki, Gibor Basri, Natalie M. Batalha, Timothy M. Brown , et al. · 2016

Physics Political science

The Kepler Mission, launched on 2009 March 6, was designed with the explicit capability to detect Earth-size planets in the habitable zone of solar-like stars using the transit photometry method. Results from just 43 days of data along wit…

Novel Microtomy Methods For Small, Hard And Precious Extraterrestrial And Terrestrial Rocky Materials Open

D. E. Brownlee, D. J. Joswiak · 2015

Environmental science Computer science Materials science

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Constraints on the formation environment of two chondrule‐like igneous particles from comet 81P/Wild 2 Open

Z. Gainsforth, A. L. Butterworth, Julien Stodolna, A. J. Westphal, G. R. Huss , et al. · 2015

Geology Chemistry Physics

Using chemical and petrologic evidence and modeling, we deduce that two chondrule‐like particles named Iris and Callie, from Stardust cometary track C2052,12,74, formed in an environment very similar to that seen for type II chondrules in …

Presolar Materials in a Giant Cluster IDP of Probable Cometary Origin Open

S. Messenger, D. E. Brownlee, D. J. Joswiak, A. N. Nguyen · 2015

Geology Physics

Chondritic porous interplanetary dust particles (CP-IDPs) have been linked to comets by their fragile structure, primitive mineralogy, dynamics, and abundant interstellar materials. But differences have emerged between 'cometary' CP-IDPs a…

Radiation History of Giant Cluster Particle U2-20GCA, A Probable Cometary IDP Open

Robert O. Pepin, D. E. Brownlee, Russel L. Palma, D. J. Joswiak, D. J. Schlutter · 2015

Physics Environmental science Computer science

Spallation Ne in the giant U2-20GCA cluster IDP suggests exposure to radiation near the early Sun. Mineral chemistry links it to Comet Wild 2 coma grains.

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