The Chicxulub structure in Yucatan, Mexico, has recently been recognized as a >200-kmdiameter multi-ring impact crater of K-T boundary age. Crystalline impact melt rocks and breccias from within the crater, which have compositions similar to those of normal continental crustal rocks and which show shock metamorphic effects, have been studied for trace element and Re-0s isotope compositions. Re-...

The origin of complex organic molecules such as amino acids and their precursors found in meteorites and comets is unknown. Previous studies have accounted for the complex organic inventory of the Solar System by aqueous chemistry on warm meteoritic parent bodies, or by accretion of organics formed in the interstellar medium. This paper proposes a third possibility: that complex organics were c...

Extremely low background experiments to measure key nuclear reaction cross sections of astrophysical interest are conducted at the world's deepest underground laboratory, Jingping Underground laboratory for Nuclear Astrophysics (JUNA). High precision measurements provide reliable information understand nucleosynthetic processes in celestial objects and resolve mysteries on origin atomic nuclei ...