Lithic Astronomy: The age and origin of the elements and their incorporation in the solar nebula

岩石天文学：元素的年龄和起源以及它们在太阳星云中的结合。所有重元素都是在恒星中产生的。核合成的特征是元素的同位素组成，因此，同位素组成的测量使核天体物理学能够在实验室中得到阐明。该项目将通过测量星际颗粒和从陨石中获得的其他原始物质来检查恒星位置和太阳系中的物质之间的联系。影响太阳星云的过程的年表将通过测量放射性核素来确定。通过测量太阳系前颗粒中的Th/U，可以观察到太阳星云形成前数十亿年的星系化学演化。

Lithic Astronomy: The age and origin of the elements and their incorporation in the solar nebula. All heavy elements are produced in stars. The signature of nucleosynthesis is the isotopic composition of the elements and thus measurement of isotopic compositions allows nuclear astrophysics to be elucidated in the laboratory. This project will examine the linkages between stellar sites and the material in our solar system through measurement of interstellar grains and other primitive material obtained from meteorites. A chronology of processes affecting the solar nebula will be determined through measurement of radionuclides. Th/U measurements in presolar grains could allow a view of galactic chemical evolution billions of years prior to the solar nebula.