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written by the UNH Experimental Space Plasma Group
This site offers information about the interstellar medium.  It discusses what the interstellar medium is, how it has developed, how astronomers know what they know, and interactions with the Solar System.  There is both basic and more advanced material.   There are also links to other websites with more information.
Subjects Levels Resource Types
- Milky Way
= Interstellar Medium
- Lower Undergraduate
- High School
- Middle School
- Informal Education
- Instructional Material
= Tutorial
- Reference Material
Intended Users Formats Ratings
- Learners
- Educators
- General Publics
- text/html
- image/jpeg
- video/quicktime
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© 2004 University of New Hampshire Experimental Space Plasma Group
dust, gas, particles
Record Creator:
Metadata instance created March 2, 2004 by Kara Lehman
Record Updated:
March 3, 2010 by Lyle Barbato
Other Collections:

composition of ism

Author: William H. Waller
Posted: July 18, 2004 at 4:00PM

Please check your compositional percentages.
They should be more like 75% hydrogen and
25% helium by mass -- not 90% and 10% as I
read during a tour of

Bill Waller
Tufts University

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AIP Format
Experimental Space Plasma Group, (2004), WWW Document, (
Experimental Space Plasma Group, The Interstellar Medium (2004), <>.
APA Format
Experimental Space Plasma Group. (2004). The Interstellar Medium. Retrieved December 4, 2023, from
Chicago Format
Experimental Space Plasma Group. The Interstellar Medium. 2004. (accessed 4 December 2023).
MLA Format
Experimental Space Plasma Group. The Interstellar Medium. 2004. 4 Dec. 2023 <>.
BibTeX Export Format
@misc{ Author = "Experimental Space Plasma Group", Title = {The Interstellar Medium}, Volume = {2023}, Number = {4 December 2023}, Year = {2004} }
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%Q Experimental Space Plasma Group %T The Interstellar Medium %D 2004 %U %O text/html

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%0 Electronic Source %A Experimental Space Plasma Group, %D 2004 %T The Interstellar Medium %V 2023 %N 4 December 2023 %9 text/html %U

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