Molecular gas is a field of research in astronomy that focuses on the study of molecules in interstellar space. This includes the study of the properties, distribution, and dynamics of molecular gas in various astronomical objects such as galaxies, star-forming regions, and protoplanetary disks. Molecular gas is an important component of the interstellar medium and plays a crucial role in the formation and evolution of stars and planetary systems. Researchers in this field use a variety of observational techniques, such as radio telescopes and infrared instruments, to study the chemical composition and physical conditions of molecular gas in different environments. By studying molecular gas, astronomers can gain insight into the processes that drive star formation and the evolution of galaxies.