Gas disks refer to a specific area of research within astrophysics that focuses on studying the dynamics and properties of gaseous disks found in various astronomical objects such as protoplanetary disks, accretion disks around black holes, and spiral galaxies. Gas disks play a vital role in the formation and evolution of these celestial bodies, as well as in the processes of star formation and accretion onto compact objects. Research in this area often involves studying the movement of gas within these disks, their temperature and density profiles, and how they interact with other objects in their surroundings. The study of gas disks is crucial for understanding the formation and evolution of the universe as a whole.