We review recent observational and theoretical results concerning the presence of actinide nuclei on the surfaces of old halo stars and their use as an age determinant. We present evidence that the observed universality of abundances for 56 < Z < 75 elements in these stars does not imply a unique astrophysical site for the r-process. Neither does it imply a universality of abundances of nuclei ...

Thin and Thick disk metallicities overlap, but α(Fe) relations differ; there is also a hiatus in time before the first thin-disk stars, with a minimum metallicity [Fe/H] ≃ −0.6. Thus there are two ‘G-dwarf’ problems. We fit metallicity distribution functions (MDFs) for the two disks derived by Wyse & Gilmore (1995) with analytical models (for O and Mg). The Thick disk fits a simple inflow model...

The hypothesis that proximity to the Sun causes variation of decay constants at permille level has been tested and disproved. Repeated activity measurements of mono-radionuclide sources were performed over periods from 200 days up to four decades at 14 laboratories across the globe. Residuals from the exponential nuclear decay curves were inspected for annual oscillations. Systematic deviations...

the independent model used by meyer and schramm (here after m&amp;s) for determining the age ofelements (chemical evolution) is extended. using new and extended definitions and including parametersignored by m&amp;s, the galactic evolution equations are solved to determine the total duration ofnucleosynthesis,t. to be able to calculate the t t (mean age time for formation of elements to total ...