Results 71 to 80 of about 52,439 (271)
New Paradigms For Asteroid Formation
, 2015 Asteroids and meteorites provide key evidence on the formation of planetesimals in the Solar System. Asteroids are traditionally thought to form in a bottom-up process by coagulation within a population of initially km-scale planetesimals.
Cuzzi, Jeffrey N. +4 more
core +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract We report new results from a study of shock‐related features in the L6 ordinary chondrites Northwest Africa (NWA) 4672 and NWA 12841. Our observations confirm the occurrence of eight high‐pressure (HP) minerals in each meteorite, namely, ringwoodite, majorite, akimotoite, wadsleyite, albitic jadeite, lingunite, tuite, and xieite.
I. Baziotis +5 more
wiley +1 more source
Young asteroidal fluid activity revealed by absolute age from apatite in carbonaceous chondrite
Nature Communications, 2016 Chondritic meteorites formed in the early solar system and may tell us about primary processes at that time. Here, Zhang et al. report an absolute 207Pb/206Pb isochron age (4,450±50 Ma) of apatite from a carbonaceous chondrite constraining timing of ...
Ai-Cheng Zhang +7 more
doaj +1 more source
Mineralogy and Surface Composition of Asteroids
, 2015 Methods to constrain the surface mineralogy of asteroids have seen considerable development during the last decade with advancement in laboratory spectral calibrations and validation of our interpretive methodologies by spacecraft rendezvous missions ...
Burbine, Thomas H. +4 more
core +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract Angrites and eucrites are among the oldest basaltic rocks in the solar system. However, the shock histories of these meteorite groups differ markedly, as most angrites show little to no evidence of shock metamorphism. While some angrites exhibit weak wavy extinction in olivine, indicative of low‐level shock, only two—Northwest Africa (NWA ...
Atsushi Takenouchi +4 more
wiley +1 more source
Identifying LL Chondrite Near-Earth Asteroids Using LL Chondrite Reflectance Spectra
The Astrophysical Journal LettersMost near-Earth objects are thought to originate from the collisional fragments of the main asteroid belt. One question that remains to be resolved is the proportion of near-Earth objects sampling the core area material of the parent body to the outer ...
Pengyue Wang +3 more
doaj +1 more source
Earth, Planets and Space, 2023 One of the outstanding questions in planetary science is to determine how the fundamental mechanical and physical properties of materials determine the thermal evolution of asteroids, and which properties have the greatest influence.
Jonas Hallstrom, Maitrayee Bose
doaj +1 more source
MULTIPLE AND FAST: THE ACCRETION OF ORDINARY CHONDRITE PARENT BODIES [PDF]
, 2014 Although petrologic, chemical, and isotopic studies of ordinary chondrites and meteorites in general have largely helped establish a chronology of the earliest events of planetesimal formation and their evolution, there are several questions that cannot ...
P. Vernazza +11 more
semanticscholar +1 more source
3D SR‐μXCT analysis for lithology detection: Application to Ryugu sample A0159
Meteoritics &Planetary Science, EarlyView.Abstract Extraterrestrial breccia samples are formed through impact‐related processes that combine the fragments of distinct lithologies. As such, they are valuable indicators of the complex formation and evolution history of planetesimals in our solar system.
Léna Jossé +9 more
wiley +1 more source
An asteroidal origin for water in the Moon
Nature Communications, 2016 Recent samples have shown that the Moon's interior, previously thought to be anhydrous, contains water, yet how this water was delivered is unclear. Here, using isotopic analyses and modelling, Barnes et al.
Jessica J. Barnes +5 more
doaj +1 more source