English: The interstellar medium is matter that occupies the vast space between the stars in a galaxy. Similarly, matter that exists in the space between galaxies is called the intergalactic medium.
matter and radiation in the space between the star systems in a galaxy, including ionic, atomic, or molecular gas, dust and cosmic rays, filling interstellar space and blending smoothly into the surrounding intergalactic space
|Instance of||term (astrophysics)|
|Part of||outer space|
This category has the following 4 subcategories, out of 4 total.