Scientific thought has argued in a centuries long process, demanding that the paths that often introduced misinterpretations, distorted or simply part of natural phenomena. Nevertheless, any new concept, it is proved valid or not, induced maturation of ideas through which the reality has slowly edged our eyes in a completely new ...

(Giorgio Bressan and Dario Giaiotti)

The history of radio astronomy experiment begins in the thirties of the twentieth century. At the beginning of last century radio communications had taken the first steps and soon had understood that they would revolutionize the way of life of men.

(Rose M. Mistretta)

A dark night, a starry sky, millions of stars shine silent, motionless on the celestial sphere. But how far are the stars?

The last century witnessed the birth of a new vision of the universe, thanks to technical and theoretical development of the various branches of astronomy. In the first decades of the twentieth century came the ultimate certainty that the universe did not end at the edge of our galaxy: it was nothing but one of many "islands" of stars exist in outer space.