ALL meanings of interstellar medium
in·ter·stel·lar me·di·um
I i - noun interstellar medium the matter occurring between the stars of our Galaxy, largely in the spiral arms, and consisting mainly of huge clouds of ionized, neutral, or molecular hydrogen 0
- noun interstellar medium (astronomy) The matter that exists in the space between star systems in a galaxy, including gas, dust, and cosmic rays. 0