Planetary science: When is a meteorite not a meteorite?
نویسندگان
چکیده
منابع مشابه
Cometary and Meteorite Swarm Impact on Planetary Surfaces
The velocity flow fields, energy partitioning, and ejecta distributions resulting from impact of porous (fragmented) icy cometary nuclei with silicate planetary surfaces at speeds from 5 to 45 km/s are different than those resulting from the impact of solid ice or silicate meteorites. The impact of ! g/cm 3 ice spheres onto an atmosphereless anorthosite planetary surface induces cratering flows...
متن کاملMeteorite studies
eteorites yield a wealth of information concerning Solar System origin, geochemical evolution of primitive parent objects, and irradiation histories of material in space. Since the numerous (approximately 16,000) antarctic meteorites include many of rare or unique types, current extraterrestrial materials research attention focuses on this population. Antarctic meteorites also have the potentia...
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1Planetary Geosciences Institute, Department of Geological Sciences, University of Tennessee, Knoxville, Tennessee 37996-1410, USA 2Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygin St. 19, Moscow 117975, Russia 3Institute of Meteoritics, University of New Mexico, Albuquerque, New Mexico 87131, USA 4Department of Civil Engineering and Geological ...
متن کاملSodium-22 from Supernovae: a Meteorite Connection
There are several meteoritic noble gas components whose isotopic abundances are distinctly different from the solar abundance. One of these components, Ne-E(L), is a 22Ne-rich component carried by presolar graphite. Neon-22 is dominantly from the radiogenic decay of 22Na (T1/2 = 2.6 a), but it also contains 22Ne produced by 14N(α, γ )18F(e+ν)18O(α, γ )22Ne. The proportions of 22Ne from the two ...
متن کاملFossil diatoms in a new carbonaceous meteorite
We report the discovery for the first time of diatom frustules in a carbonaceous meteorite that fell in the North Central Province of Sri Lanka on 29 December 2012. Contamination is excluded by the circumstance that the elemental abundances within the structures match closely with those of the surrounding matrix. There is also evidence of structures morphologically similar to red rain cells tha...
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ژورنال
عنوان ژورنال: Nature
سال: 1983
ISSN: 0028-0836,1476-4687
DOI: 10.1038/303384a0