2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41739We review the role of massive neutrinos in astrophysics and cosmology, assuming that the oscillation interpretation of solar and atmospheric neutrinos is correct. In particular, we discuss cosmological mass limits, neutrino flavor oscillations in the early universe, leptogenesis, and neutrinos in core-collapse supernovae.Procs. International School of Physics ``Enrico Fermi,'' CLII Course ``Neutrino Physics,'' 23 July-2 August 2002, Varenna, Lake Como, Italy. Additional references in revised versionHigh Energy Physics - Phenomenologytext