Andrea Possenti. Physics graduate at the University of Milan and researcher at Istituto Nazionale di Astrofisica (INAF), he is currently head researcher at INAF Astronomical Observatory in Cagliari. Author of more than 250 publications in international scientific magazines, he is part of the limited group of European scientists that obtained the Premio Cartesio 2005. He is currently board member of the international experiment IPTA, aimed to reveal gravitational waves through pulsar observation. He has been actively engaged in astronomic divulgation, taking part in more than 300 public conferences. He published two divulgation books: Eclissi (Mursia, 1999) and Comete, diario di viaggio (Mimesis, 2002).