The surfaces of airless planetary bodies are subject to a barrage charged particles, photons, and meteoroids. This high-energy space environment alters the creates tenuous atmosphere ejected particles surrounding celestial bodies. Experiments with well characterized analogue materials under controlled laboratory conditions needed interpret observations these atmospheres improve composition mode...

Midand far-infrared spectra gained by the Short Wavelength Spectrometer (SWS) of the Infrared Space Observatory (ISO) satellite have provided striking evidence for the presence of crystalline silicates in comets, circumstellar envelopes around young stars and, most of all, evolved stars and planetary nebulae. Since optical properties of astrophysically relevant crystalline silicates are lacking...

Abstract We investigated the stable isotope fractionation of chromium (Cr) for a panorama chondrites, including EH and EL enstatite chondrites their chondrules different phases (by acid leaching). observed that have heterogeneous δ 53 Cr values (per mil deviation Cr/ 52 from NIST SRM 979 standard), which we suggest reflect physical conditions in chondrite accretion regions. Chondrules primitive...

Abstract The presence of highly siderophile elements in Earth’s mantle indicates that a small percentage mass was delivered after the last giant impact stage “late accretion.” There is ongoing debate about nature late-accreted material and sizes bodies. Earth appears isotopically most similar to enstatite chondrites achondrites. It has been suggested late accretion must have dominated by enstat...