Interstellar medium
MATTER AND RADIATION IN THE SPACE BETWEEN THE STAR SYSTEMS IN A GALAXY
Interstellar gas; Interstellar matter; Interstellar Medium; Space, Interstellar; Interstellar wind; Stellar fog; Cosmic fog; Interstellar radiation field; Inter-stellar space; Interstellar magnetic field; Warm Neutral Medium; Warm Ionised Medium; Interstellar media; VLISM
In astronomy, the interstellar medium is the matter and radiation that exist in the space between the star systems in a galaxy. This matter includes gas in ionic, atomic, and molecular form, as well as dust and cosmic rays.