 Star formation, star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as stellar nurseries or star-forming regions collapse and form stars. As a branch of astronomy, star formation includes the study of the interstellar mediumism and giant molecular clouds. GMC has precursors to the star formation process, and the study of protostars and young stellar objects has its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.