Vapour, or Meteoritic Particle
نویسندگان
چکیده
منابع مشابه
Racemization of Meteoritic Amino Acids
Meteorites may have contributed amino acids to the prebiotic Earth, affecting the global ratio of right-handed to left-handed (D/ L) molecules. We calculate D/ L ratios for seven biological, α-hydrogen, protein amino acids over a variety of plausible parent body thermal histories, based on meteorite evidence and asteroid modeling. We show that amino acids in meteorites do not necessarily underg...
متن کاملInfrared spectra of meteoritic SiC grains
We present here the first infrared spectra of meteoritic SiC grains. The mid-infrared transmission spectra of meteoritic SiC grains isolated from the Murchison meteorite were measured in the wavelength range 2.5–16.5 μm, in order to make available the optical properties of presolar SiC grains. These grains are most likely stellar condensates with an origin predominately in carbon stars. Measure...
متن کاملAbundances of the elements: Meteoritic and solar
New abundance tables have been compiled for Cl chondrites and the solar photosphere and corona, based on a critical review of the literature to mid-1988. The meteorite data are generally accurate to +5-10%. Significant discrepancies between Sun and meteorites occur only for Fe, Mn, Ge, Pb, and W; other well-determined elements agree to &90/o on the average. There is no evidence for group fracti...
متن کاملThe Supernova Trigger and Meteoritic Components
Supernova Environment and Triggered Molecular Cloud Collapse: I have been studying the operation of the r-process in a core collapse supernova just after the large flux of neutrinos and antineutrinos has blown the presupernova envelope off the newly formed neutron star [1,2]. The hot (10 K) neutron star surface will emit a wind largely composed of neutrons, but these will only build up r-proces...
متن کاملThe SiC problem : astronomical and meteoritic evidence
Pre-solar grains of silicon carbide found in meteorites and interpreted as having had an origin around carbon stars from their isotopic composition, have all been found to be of the β-SiC polytype. Yet to date fits to the 11.3-µm SiC emission band of carbon stars had been obtained only for α-SiC grains. We present thin film infrared (IR) absorption spectra measured in a diamond anvil cell for b...
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ژورنال
عنوان ژورنال: Nature
سال: 1889
ISSN: 0028-0836,1476-4687
DOI: 10.1038/039537c0