... The new meteorites are moderately weathered, impact-melt breccias. ... Dhofar 304 is a brownish-gray, moderately weathered stone weighing 10 g. This is an impact-melt breccia in which mineral fragments and lithic clasts are embedded in a fine-grained impact-melt matrix. ... Dhofar 306 is a light-gray, moderately weathered stone weighing 2.6 g. This is an impact-melt breccia composed of mineral fragments and lithic clasts cemented by a fine-grained, impact-melt matrix. ... 3 Dhofar 306 Mg/(Mg+Fe), at...

... dust_AbsXSec . Absorption Cross section. typedef void . ... Calculates the equilibrium temperature given the absorption cross section and a radiation field. double . ... Calculates the absortion cross section of a species/size of dust grain . ... The grain absorption cross section . ... The absorption cross section of the grain . ... Calculates the equilibrium emission at wavelength lambda from a (large) grain at temperature T and with absorption cross section xsection. double dust_EquiT . ...

... Staff . ... Cosmic dust has been observed both in emission and extinction everywhere in our Galaxy as well as in many other galaxies. ... Dust grains are classically thought to form in the winds of Asymptotic Giant Branch (AGB) stars. However, nowadays there is increasing observational evidence for notable dust formation in Supernovae (SNe). ... Hence the observed dust mass of 0.7вИТ0.9M вКЩ in this source can be safely considered as indicative of the mass of freshly formed dust in SN ejecta. ...

Employing the maximum entropy method (MEM) algorithm, we fit interstellar extinction measurements that span the wavelength range 0.125-3 ЮМm. We present a uniform set of MEM model fits, all using the same grain materials, optical constants, and abundance constraints. ... Although such usage is only a first step, the results do provide interesting insight into the use of grain size as a diagnostic of dust environment. ... ADS ] . ADS Citation Query . ... citations vs. year [year,citations] . ...

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... Grains of cosmic sand and gravel shed from Comet Swift-Tuttle will streak across the sky as they vaporize during entry into Earth's atmosphere. ... Fragments of Comet LINEAR . ... The question is definitely relevant to comet LINEAR (C/1999 S4 LINEAR) whose nucleus apparently fragmented late last month during its first trip through the inner solar system. ... Comet LINEAR Disperses . ... What's happened to the nucleus of Comet LINEAR? ... The Coma Cluster of Galaxies . ... July . ...

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ii mm Emiissiion from Dust i li iin Gallaxiies i Michael A. Dopiita, ii ll li i l i RSAA, Australliian Natiionall Universiity ii Research School of Astronomy & Astrophysics mm Workshop 2001 i I Why iis Dust IImportant? ... Theory is rather more complex than for electric dipole emission (Draine & Lazarian, 1999 ApJ, 512, 740) Research School of Astronomy & Astrophysics mm Workshop 2001 Research School of Astronomy & Astrophysics mm Workshop 2001 ?? ...

... The GALFA Continuum Transit Survey group ( GALFACTS ; PI: A. R. Taylor) has conducted several test observations and will begin an all-sky full-Stokes continuum survey later this year with the new P-ALFA spectrometer. ... Sample Perseus images of GALFA H I 21cm-line and full-Stokes continuum emission are shown below along with maps of molecular (CO) gas, thermal dust, and ionized gas optical emission for comparison. ... The GALFA H I emission appears to envelop the molecular cloud gas traced by CO. ...

Next: Polarization efficiency: size/shape/orientation effects Up: Optical properties of cosmic Previous: The 2175? feature . To model the interstellar polarization one needs to calculate the forward-transmitted radiation for an ensemble of non-spherical aligned dust grains. ... Let non-polarized stellar radiation passes through a dusty cloud with a homogeneous magnetic field. ... The angle between the line of sight and the magnetic field is ( ). ... where the angle is connected with and ( ). ...

A study of the size and composition of dust grains in the circumstellar envelope of IRC + 10 o 216 S. Bagnulo, J.G. Doyle and I.P. Griffin We utilise a modelling technique in which a generalised two­stream Eddington approximation is applied to the problem of the radiative transfer in a spheri­ cally symmetric dust shell. ...

Trying times came to my door Go be brave ones, let them in All the sorrows we have borne Will rise and ride on the morning wind I'll fill my pockets with grains of gold I don't mind the rain and cold Once the fields were autumn wild And the child had only time She was given the power of all the gods They said all the world was mine to find I'd fill my pockets with grains of gold I didn't mind the ...

... Ciel Espace, le magazine qui vous guide toujours plus loin . ... Ciel Espace, nouvelle formule, c'est . des actualit†йs . des reportages . ... des pages consacr†йes †а la publication de vos photos Mais c'est aussi une vraie communaut†й avec laquelle partager votre passion et nourrir votre curiosit†й. Accueil Curiosity d†йcouvre un †йtrange objet sur Mars . ... Curiosity n'est pas le premier robot †а semer des pi†иces sur Mars. ... 10/03/2016 - LтАЩEurope part chercher la vie sur Mars . ...

... G.Gottstein, L.S.Shvindlerman On the orientation dependence of grain boundary migration Scripta Metall. Mater., ... Mater., 27 (1992) 1521-1526. tilt grain boundaries in (Fe- 10at.% ... G.Gottstein, L.S.Shvindlerman Theory of grain boundary motion in the presence of mobile particles Acta Metall. ... B.Straumal, E.Rabkin, W.Lojkowski, W.Gust, L.S.Shvindlerman Pressure Influence on the Grain Boundary Wetting Phase Transition in Fe-Si Alloys Acta Mater., 1997, v.45, No 5, pp.1931-1940. ...

... 2009 May 11 . Forty Thousand Meteor Origins Across the Sky . ... Explanation: Where do meteors come from? ... Many a meteor shower has been associated with a known comet , although some intriguing orphan showers do remain. ... Besides known meteor showers, eleven new showers were identified by new radiants on the sky from which meteors appear to flow. The meteor sky is ever changing, and it may be possible that new shower radiants will appear in the future. ... About APOD | ...

Astronotes Armagh Planetarium's Stellar Blog! ... Colin Johnston . ... This submillimetre-wavelength image of the region surrounding the reflection nebula M78 made with the Atacama Pathfinder Experiment (APEX) telescope (overlaid on a view of the same region in visible light) shows the position of interstellar dust grains (orange) to show where new stars are being formed.( ... Here you will find the latest news and views from the fascinating worlds of astronomy and space exploration. ...

... DP = dirty picture Dust specks or dirt are evident on the finding chart. ... Identifications Within 2 Arcmin of Known Clusters of Galaxies The letter preceding the cluster catalog number: a = Abell Cluster z = Zwicky Cluster The notations following the catalog number: cc = at cluster center nc = not at cluster center mc = near cluster center ni = not identified with probable cluster member c: = cluster not obvious on finding chart ef = identification is EF (empty ...

... The dynamics of silicate and graphite particles with radii of (0.1-2) 10 -5 cm in the vicinity of the Milky Way is considered. The equation of motion of dust grains is integrated with gravitational attraction, radiation pressure, gas drag, and dust destruction taken into account. The effect of other factors on the motion of grains are discussed. ... Dust is swept out of the Galaxy by radiation pressure from stars at a rate of 0.04 M o yr -1 . ...

... Properties of Dust Grains in Planetary Nebulae - I. The Ionized Region of NGC 6445 . ... Based on this model, we show from depletions in the gas phase elements that little grain destruction can have occurred in the ionized region of NGC 6445. ... The most likely conclusion is that grains are residing inside the ionized region of NGC 6445 and that the low temperature and flux of the grain emission are caused by the low luminosity of the central star and the low optical depth of the grains. ...

Spirit spent most of the last martian winter on standby, conducting science as it waited for winter to pass. This mosaic was made by Spirit's microscopic imager November 27, 2006, and shows "King George Island" after the rock was brushed by the rover's rock abrasion tool. The mosaic covers approximately 6 centimeters (2.4 inches) across and shows the rock's granular nature. The grains are about 1 millimeter (.04 inches) wide. ...