A survey of the Milky Way building blocks with the Hubble Space Telescope.

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Recent studies have resulted in one of the most exciting and unexpected developments in stellar-population studies: the discovery of multiple stellar generations in globular clusters. These findings have dramatically changed the traditional picture of these seemingly simple stellar systems and provided evidence that the globulars are building blocks of the Galactic halo. The Hubble Space Telescope is in the process of collecting a large amount of data as part of the first survey of multiple generations in globular clusters. The project is based on this unique dataset and aims to provide a major advance to understand the origin and the evolution of globular clusters, as well as the formation mechanisms that build the Milky Way.