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In astronomy, the interstellar medium (sometimes called the ISM) is the tenuous gas and dust that fills the void between stellar systems in galaxies, that consisting mainly of huge clouds of ionized, netral, or moleculer hydrogen. This gas and dust not distributed uniformly in interstellar space, but displays significant variations in density, temperature, and ionization state.
- "Definition of interstellar medium | Dictionary.com" (in en). https://www.dictionary.com/browse/interstellar-medium.
- Snell, Ronald L. (2011). Gargaud, Muriel. ed (in en). Encyclopedia of Astrobiology. Berlin, Heidelberg: Springer. pp. 837–843. . . https://doi.org/10.1007/978-3-642-11274-4_801.