The PhD course in Astronomy Astrophysics and Space Science (AASS) -- jointly run by Sapienza University of Rome, University of Rome "Tor Vergata" and National Institute of Astrophysics (Rome OAR, Rome IAPS, Teramo OAAb offices) -- trains internationally competitive researchers in the field of Astrophysics and Space Sciences, who carry out their research activity in the following reference areas: - Cosmology and Gravitation - Extragalactic Astrophysics - Planetary and Solar Physics - Space Science Techniques - Stellar and Galactic Astrophysics At the end of her/his course, the PhD student must acquire: - the ability to independently prepare a research program; - the technical-mathematical-IT and physical skills necessary to carry out a research program; - mastery of the English language necessary for a complete understanding of the scientific literature; - the ability to identify problematic aspects in planning and carrying out research; - the ability to work in a team also with coordination roles; - the mastery in presenting the results and knowledge acquired both in front of a specialist public and an audience of non-experts. The acquisition of these skills also passes through a didactic offer aimed at the specific topics of the doctorate and through the possible participation in national and international schools and workshops dedicated to doctoral students in Astrophysics and/or Space Sciences.