In 1960, Varsavsky returned to Argentina, where he joined the newly created group of Astrophysics at the University of Buenos Aires and worked as senior lecturer in physics until 1966.
Furthermore, he participated in the construction of the largest radio telescope in the Southern Hemisphere, which is located in Villa Elisa, Buenos Aires.
During the Periodo de facto (the military juntas of 1966–1973 and 1976–1983) and in a university environment, Varsavsky maintained a consistent democratic attitude – even during the incident that is known as “la noche de los bastones largos” in which the military of Juan Carlos Onganía government attacked the Faculty of Mathematical and Natural Sciences of Buenos Aires.
Students, graduates and professors were beaten with the aim of dismantling the reformist project of building a university of science of excellence.
Every school, factory, office, shop, home, road that the public invests in building would be used every day of the year, but not by the same people.