The space between the stars in the Messier 87 galaxy is filled with a diffuse interstellar medium of gas, which has been chemically enriched by the elements ejected from stars as they passed beyond the end of their main sequence lifetime.
The space between the stars in the Messier 87 galaxy is filled with a diffuse interstellar medium of gas. Gas has been chemically enriched by the elements. These elements are ejected from stars. They passed beyond the end of their main sequence lifetime.