Interstellar space

Interstellar space refers to the vast region between stars within a galaxy. It is not empty but contains low-density gas, dust, and cosmic radiation. This space lies beyond the influence of any single star's gravity, making it a cold, dark expanse. Distances are immense; for instance, it takes light from the nearest star over four years to reach us. Interstellar space is important for understanding the structure of galaxies, the lifecycle of stars, and the potential for interstellar travel in the future. Despite its emptiness, it plays a crucial role in the universe's dynamics.