interstellar medium

== English == === Noun === interstellar medium (astronomy) The matter that exists in the space between star systems in a galaxy, including gas, dust, and cosmic rays. ==== Synonyms ==== ISM (abbreviation) ==== Derived terms ==== ISM (abbreviation) ==== Related terms ==== intracluster medium (ICM) intergalactic medium (IGM) interplanetary medium (IPM) extragalactic medium (EGM) extra-cluster medium (ECM) interstellar space ==== Translations ==== ==== See also ==== interplanetary space intergalactic space extragalactic space deep space near space outer space Earthspace space