interstellar medium
noun1
Astronomy, Natural sciences The matter that exists in the space between star systems in a galaxy, including gas, dust, and cosmic rays.
- Synonyms
- ISM
- Derived terms
- ISM
- Related terms
- intracluster medium, intergalactic medium, interplanetary medium, extragalactic medium, extra-cluster medium, interstellar space, interplanetary space, intergalactic space, extragalactic space, deep space, near space, outer space, Earthspace, space