The short-lived radionuclides (SLRs) have a half-life ≤ 100 Myr. γ-ray observations and excess abundance of their daughter nuclides in various meteoritic phases confirm the existence SLRs Galaxy early solar system (ESS), respectively. In this work, we developed Galactic Chemical Evolution (GCE) models for SLRs, 26 Al, 60 Fe along with 36 Cl, 41 Ca, 53 Mn. These predict temporal spatial evolutio...

We find that the globular cluster systems of the Milky Way and of our neighboring spiral galaxy, M31, comprise two distinct entities, differing in three respects. First, M31 has a set of young globular clusters (GCs), ranging in age from a few 100 Myr to 5 Gyr old, as well as old globular clusters. No such very young GCs are known in the Milky Way. Second, we confirm that the oldest M31 GCs hav...

The star-formation histories of the main stellar components of the Milky Way constrain critical aspects of galaxy formation and evolution. I discuss recent determinations of such histories, together with their interpretation in terms of theories of disk galaxy evolution.

We review observational evidence bearing on the formation of a prototypical large spiral galaxy, the Milky Way. New groundand space-based studies of globular star clusters and dwarf spheroidal galaxies provide a wealth of information to constrain theories of galaxy formation. It appears likely that the Milky Way formed by an combination of rapid, dissipative collapse and mergers, but the relati...