The Interstellar Medium (ISM)

The Orion Nebula

The interstellar medium is the material that lies between the stars in a galaxy. This material can exist in several phases with a wide range in temperature (from tens of degrees to tens of millions of degrees Kelvin). In the coldest regions the material consists of molecular gas and dust; in the hottest regions the material is almost completely ionized.

A few ISM links:

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Dr. Michael Juda
Harvard-Smithsonian Center for Astrophysics
60 Garden Street, Mail Stop 70
Cambridge, MA 02138, USA
Ph.: (617) 495-7062
Fax: (617) 495-7356
mjuda at cfa dot harvard dot edu