Stars are opaque. Until quite recently, we had to assume that the results given by the theory of stellar structure and evolution are correct, and that the structure of a stellar model is indeed the structure of the star being modelled. Asteroseismology has changed that. Solar observatories such as GONG, SOHO/MDI, SDO/HMI and stellar ones like CoRoT and Kepler have provided us with a wealth of data that have allowed us to look into the opaque heart of stars and study what lies within. In this talk I shall discuss some of the highlights of what we have learned about the Sun and other stars over the last few years.
**Coffee and tea will be served before the talk starting at 2:00 PM in the coffee lounge at 52 Hillhouse**