Results 101 to 110 of about 11,238 (241)

Stability toward High Energy Radiation of Non-Proteinogenic Amino Acids: Implications for the Origins of Life

Life, 2013
A series of non-proteinogenic amino acids, most of them found quite commonly in the meteorites known as carbonaceous chondrites, were subjected to solid state radiolysis in vacuum to a total radiation dose of 3.2 MGy corresponding to 23% of the total ...
Yaser Hafez, Giancarlo Angelini, Franco Cataldo, Susana Iglesias-Groth   +3 more
doaj   +1 more source

Size Constraints for the Pre-atmospheric Parent Bodies of Ordinary Chondrites

The Planetary Science Journal
The study of S-complex near-Earth objects (NEOs), the parent bodies of ordinary chondrites, has shown that they are dominated by asteroids with LL chondrite-like compositions. This is surprising because among the three subtypes of ordinary chondrites (H,
Juan A. Sanchez, David C. Cantillo, Adam Battle, Miren Miranda, Benjamin N. L. Sharkey, Tanner S. Campbell, Rogerio Deienno, William F. Bottke, David Nesvorný, Vishnu Reddy   +9 more
doaj   +1 more source

Laboratory Experiments Identify Meteoritic Organic Precursors for Chlorinated Compounds Detected by the Sample Analysis at Mars (SAM) Instrument at Gale Crater

Journal of Geophysical Research: Planets, Volume 131, Issue 11, November 2026.
Abstract The Viking missions landed two spacecraft on Mars each equipped with a pyrolysis‐gas chromatograph‐mass spectrometer system capable of detecting signs of life. Although working as intended, detections of chloromethane and dichloromethane were initially attributed to terrestrial contamination.
A. Mojarro, J. Herrera, A. Sistiaga, S. S. O’Reilly, J. C. Aponte, A. Buch, J. L. Eigenbrode, D. P. Glavin, C. Freissinet, M. Millan, C. Szopa, R. E. Summons   +11 more
wiley   +1 more source

Volatile Element Depletion of Carbonaceous Chondrites—Insights from Mass-dependent Zinc, Cadmium, and Tellurium Isotope Variations

The Astrophysical Journal
The origin of volatile depletion in the solar system remains a topic of intense debate. To further inform our understanding of the mechanisms involved, this study characterized the mass-dependent Zn, Cd, and Te isotope compositions and concentrations of ...
Elin M. Morton, Harvey Pickard, Frank Wombacher, Yihang Huang, Emeliana Palk, Rayssa Martins, Sven Kuthning, Maria Schönbächler, Mark Rehkämper   +8 more
doaj   +1 more source

NH4‐Smectites as Potential Precursors of Nitrogen Compounds Evolved During Analyses by the Sample Analysis at Mars (SAM) Instrument on the Curiosity Rover

Journal of Geophysical Research: Planets, Volume 131, Issue 10, October 2026.
Abstract Ammonium (NH4+) in the interlayer space of phyllosilicates has been proposed as a potential but underexplored nitrogen reservoir on Mars. We synthesized ammonium‐exchanged smectites (montmorillonite SWy‐2 and nontronite NAu‐2) and analyzed them, both as pure phases and in mixtures containing five or 20 wt.% magnesium (Mg) perchlorate, under ...
S. Andrejkovičová, A. C. McAdam, J. C. Stern, M. Millan, R. Navarro‐González, C. A. Knudson, S. T. Wieman, E. B. Rampe, D. W. Ming, C. N. Achilles, S. S. Johnson, F. Rocha, C. A. Malespin, P. R. Mahaffy   +13 more
wiley   +1 more source

The origin of chondrules and chondrites

, 2004
A 2004 summary of the ideas surrounding the origin and history of chondrules and ...
Sears, Derek W G, Derek W. G. Sears
core   +1 more source

Life on Mars? The physiological perspective

Experimental Physiology, EarlyView.
Ronan M. G. Berg, Damian M. Bailey
wiley   +1 more source

Subseafloor Temperature Variability During Ridge‐Flank Hydrothermal Circulation: Implications for a Moderate‐Temperature Earth System and Other Ocean Worlds

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 10, October 2026.
Abstract Subseafloor hydrothermal circulation drives biogeochemical exchange between the solid Earth and its ocean, and could play a similar role in other ocean worlds. We assess the scale of subseafloor temperature (T) variations during hydrothermal circulation in ∼3.5 Ma seafloor on the eastern flank of Juan de Fuca Ridge. This well‐studied, moderate
Donna K. Blackman, Kirt Robinson, Noah Randolph‐Flagg, Andrew T. Fisher, Julie A. Huber, Christopher R. German, Kristin L. Dickerson   +6 more
wiley   +1 more source

Carbonated Chondrites during Giant Impacts

The Planetary Science Journal
The volatile budget of terrestrial planets is primarily inherited from the accretion process. At this stage, impacts played a significant role in delivering or removing volatiles from the silicate of young planets.
Adrien Saurety, Razvan Caracas
doaj   +1 more source

Mantle Wedge Metasomatism During Subduction Initiation: Mineral Transformations and Fluid Fluxes (BOIC Ophiolite, Newfoundland)

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 10, October 2026.
Abstract The soles of ophiolites preserve slices of oceanic crust metamorphosed to amphibolite‐ to granulite‐facies conditions beneath heavily deformed mantle peridotites, providing key records of fluid and mass transfer across nascent subduction interfaces.
Louise Mérit, Philippe Agard, Loïc Labrousse, Benoît Dubacq, Cécile Prigent, Carl Guilmette, Jean H. Bédard, François Fournier‐Roy, Horst R. Marschall, Axel Gerdes, Benjamin Lefeuvre, Alana Hinchey   +11 more
wiley   +1 more source