Interstellar Medium

The interstellar medium (ISM) is the gas and dust that is prevalent between the stars in many galaxies. It is mostly Hydrogen with trace amounts of other elements. Some regions have more heavy elements (heavier than Helium) than others. Within the medium there are very large clouds that are slightly more dense than average.
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Bryan J. Mendez
Last modified: Sat Jun 17 21:34:34 PDT 2000