Interstellar space is the vast region between star systems in a galaxy. It is mostly empty, containing very low densities of particles, primarily hydrogen and helium, along with cosmic rays and magnetic fields. This area is where the influence of individual stars diminishes, and the distances between them become immense. In our Milky Way galaxy, interstellar space is estimated to extend about 4.24 light-years to the nearest star system, Alpha Centauri. Despite its emptiness, interstellar space plays a crucial role in the life cycle of stars and the formation of new celestial bodies.