Results 91 to 100 of about 64,884 (241)

Heating of near-Earth objects and meteoroids due to close approaches to the Sun

, 2009
It is known that near-Earth objects (NEOs) during their orbital evolution may often undergo close approaches to the Sun. Indeed it is estimated that up to ~70% of them end their orbital evolution colliding with the Sun.
A. Morbidelli, Bottke, Bottke, Bowell, Brucato, Bus, Carvano, Delbo', Delbo', Emery, Grimm, Harris, Harris, Harris, Harris, Hiroi, Hiroi, Keil, Lagerros, Lim, M. Delbo', M. Lazzarin, Marchi, Marchi, Morbidelli, Mustard, P. Paolicchi, Paolicchi, Rivkin, S. Marchi, Salisbury, Spencer, Stuart, Vilas, Wolters, Zavodny   +35 more
core   +3 more sources

The Spiral Structure of the Milky Way, Cosmic Rays, and Ice Age Epochs on Earth [PDF]

, 2002
The short term variability of the Galactic cosmic ray flux (CRF) reaching Earth has been previously associated with variations in the global low altitude cloud cover. This CRF variability arises from changes in the solar wind strength.
Alvarez, Amaral, Avedisova, Barry, Bazilevskaya, Beer, Begelman, Bell, Berezinskiı̆, Binney, Blitz, Christensen-Dalsgaard, Comeron, Compton, Creze, Dame, Dickinson, Dilke, Dopita, Dragicevich, Efremov, Egorova, Elmegreen, Feitzinger, Fernández, Frakes, Friis-Christensen, Gallagher, Gardiner, Georgelin, Gordon, Grivnev, Grivnev, Guyodo, Haigh, Hambrey, Hampel, Harrison, Hernandez, Heyer, Hodell, Hoffman, Hoyle, Hoyle, Huber, Ivanov, Kirkby, Labitzke, Lavielle, Leitch, Lin, Lisenfeld, Lo, Loktin, Longair, Lukasiak, Lynds, Marsh, Michel, Mishurov, Mishurov, Napier, Neff, Nelson, Ney, Nir J. Shaviv, Olling, Palle Bago, Palous, Perko, Pudovkin, Rind, Robin, Rocha-Pinto, Rocha-Pinto, Ruphy, Schaeffer, Shaviv, Simpson, Singer, Soon, Soon, Steiner, Stozhkov, Svensmark, Svensmark, Tammann, Taylor, Tinsley, Vallenari, Vallée, Vallée, van den Bergh, Veizer, Voshage, Voshage, Voshage, Webber, Westerlund, Wiedenbeck, Wielen, Wielen, Williams, Yabushita, Yuan, Yuan, Zachos   +106 more
core   +2 more sources

Experimental constraints on the origin of metal and carbon in ureilite meteorites

Meteoritics &Planetary Science, EarlyView.
Abstract Ureilites are carbon‐rich ultramafic achondrites that display unique textures, including strips of metal and carbon phases situated along grain boundaries and in fractures. Shock metamorphism observed in ureilites suggests an episode of brittle deformation caused by impact disruption of their parent body.
Nicolas P. Walte, Max Collinet, Cyrena A. Goodrich   +2 more
wiley   +1 more source

Radiocarbon datings of Yamato meteorites [PDF]

The terrestrial ages of five Yamato Meteorites were measured by the content of cosmic-ray-produced carbon-14. Three Yamato Meteorites Y-74013, Y-74097, and Y-74136, which are all diogenites, were found at sites from one to two kilometers apart from each ...
Kigoshi, K., Matsuda, E.
core   +1 more source

Chromite in main group pallasite meteorites: Accessory mineral tracing planetesimal differentiation

Meteoritics &Planetary Science, EarlyView.
Abstract Main group pallasite meteorites (PMG) are samples of an early, highly differentiated magmatic planetesimal dominated by olivine and metal‐sulfide‐phosphide assemblages with accessory chromite among other phases. This mineralogy reflects mantle‐ and core‐related reservoirs, but the relative contributions of each and the overall petrogenesis are
Seann J. McKibbin, Lutz Hecht, Matthew S. Huber, Christina Makarona, Stepan M. Chernonozhkin, Philippe Claeys, Steven Goderis   +6 more
wiley   +1 more source

Mysterious iodine-overabundance in Antarctic meteorites [PDF]

Halogen as well as other trace element concentrations in meteorite finds can be influenced by alteration processes on the Earth's surface. The discovery of Antarctic meteorites offered the opportunity to study meteorites which were kept in one of the ...
Dreibus, G., Schultz, L., Waenke, H.
core   +1 more source

Textural and minerochemical features of NWA 1807 and 2180, two new CV3 chondrites from northwest Africa [PDF]

, 2007
A textural and minerochemical study has been performed on NWA 1807 and 2180 chondrites in order to determine sizes and typologies of chondrules, relative abundances of mineral phases, compositions of main phases and bulk oxygen isotope ...
Franchi, I. A., Greenwood, R. C., Moggi-Cecchi, V., Pratesi, G., Salvadori, A.   +4 more
core  

Parent body thermal metamorphism of enstatite chondrites: Disentangling the effects of shock melting

Meteoritics &Planetary Science, EarlyView.
Abstract Enstatite chondrites (ECs) formed on at least two parent bodies, EH and EL. After the accretion of the EC parent bodies, EC material was subjected to varying degrees of parent body thermal metamorphism (measured by petrologic types 3–6), due to heat released by radioactive isotope decay.
Peter Mc Ardle, Rhian H. Jones, Patricia L. Clay, Romain Tartèse, Ray Burgess, Brian O'Driscoll, Eric W.G. Hellebrand, Jonathan Fellowes, Arthur Goodwin, Lewis Hughes   +9 more
wiley   +1 more source

The effect of pressure on dihedral angle between liquid Fe‐S and orthopyroxene: Implication for percolative core formation in planetesimals and planetary embryos

Meteoritics &Planetary Science, EarlyView.
Abstract During precursor stages of planet formation, many planetesimals and planetary embryos are considered to have differentiated, forming an iron‐alloy core and silicate mantle. Percolation of liquid iron‐alloy in solid silicates is one of the major possible differentiation processes in these small bodies.
Takumi Miura, Hidenori Terasaki, Hyu Takaki, Kotaro Kobayashi, Geoffrey David Bromiley, Takashi Yoshino   +5 more
wiley   +1 more source

Multiple carriers of Q noble gases in primitive meteorites

, 2015
The main carrier of primordial heavy noble gases in chondrites is thought to be an organic phase, known as phase Q, whose precise characterization has resisted decades of investigation.
Amari, Brearley, Busemann, Clark, Crowther, Crozaz, Derenne, Gilmour, Gilmour, Goles, Gros, Guillaume Avice, Hewins, Hohenberg, Huss, Huss, Kellerud, Kerridge, Lewis, Lewis, Marrocchi, Marrocchi, Marrocchi, Marrocchi, Marrocchi, Marrocchi, Mathew, Matsuda, Meshik, Meshik, Nicolas Estrade, Nishimura, Ott, Ozima, Piani, Ragettli, Tachibana, Verchovsky, Vogel, Wieler, Yves Marrocchi   +40 more
core   +2 more sources