The mineralogy of terrestrial planets evolves as a consequence of a range of physical,
chemical, and biological processes. In pre-stellar molecular clouds, widely dispersed …

Life is believed to have originated on Earth∼ 4.4–3.5 Ga ago, via processes in which
organic compounds supplied by the environment self-organized, in some geochemical …

Heavily shocked meteorites contain various types of high‐pressure polymorphs of major
minerals (olivine, pyroxene, feldspar, and quartz) and accessory minerals (chromite and Ca …

The Hadean Eon, encompassing Earth9s first 550 million years, was a time of significant
planetary evolution. Nevertheless, prebiotic Earth9s near-surface environment may have …

Seven particles captured by the Stardust Interstellar Dust Collector and returned to Earth for
laboratory analysis have features consistent with an origin in the contemporary interstellar …

From their birth as condensates in the outflows of oxygen-rich evolved stars, processing in
interstellar space, and incorporation into disks around new stars, amorphous silicates …

Extraterrestrial materials, including meteorites, interplanetary dust, and spacecraft-returned
asteroidal and cometary samples, provide a record of the starting materials and early …

ABSTRACT We report O-, Al-Mg-, K-, Ca-, and Ti-isotopic data for a total of 96 presolar oxide
grains found in residues of several unequilibrated ordinary chondrite meteorites. Identified …

We report the identification of presolar silicates (∼ 177 ppm), presolar oxides (∼ 11 ppm),
and one presolar SiO 2 grain in the Allan Hills (ALHA) 77307 chondrite. Three grains having …

Close to a thousand presolar silicate grains have been identified since their initial discovery
in interplanetary dust particles (IDPs) just over ten years ago. Studies have shown that …