UL LIAre we living in the "golden age" of cosmology?/LI LIAre we close to understanding the nature of the unknown ingredients of the currently most accepted cosmological model and the physics of the early Universe? Or are we instead approaching a paradigm shift?/LI LIWhat is dark matter and does it exist? How is it distributed around galaxies and clusters?/LI LIIs the scientific community open to alternative ideas that may prompt a new scientific revolution - as the Copernican revolution did in Galileo's time?/LI LIDo other types of supernovae exist that can be of interest for cosmology?/LI LIWhy have quasars never been effectively used as standard candles?/LI LICan you tell us about the scientific adventure of COBE?/LI LIHow does the extraction of the Cosmic Microwave Background anisotropy depend on the subtraction of the various astrophysical foregrounds?/LI/UL These, among many others, are the astrophysical, philosophical and sociological questions surrounding modern cosmology and the scientific community that Mauro D'Onofrio and Carlo Burigana pose to some of the most prominent cosmologists of our time. Triggered by these questions and in the spirit of Galileo's book "Dialogue Concerning the Two Chief World Systems" the roughly 40 interview partners reply in the form of essays, with a critical frankness not normally found in reviews, monographs or textbooks.