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Chapter 13: Interstellar Matter and Star Formation
The Interstellar Medium (ISM)
The interstellar medium is the material that exists in the space between the stars.
1) What is the temperature range of the ISM? 2) What materials can be found in the cold and hot regions of the ISM?
Visit the The Interstellar Medium web site
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The Color of the Witch Head Nebula
The Witch Head nebula is a blue reflection nebula. This site provides a beautiful view of the nebula as well as a good explanation for its color.
1) Why does the nebula appear blue? 2) Where do we see this color phenomenon in everyday life?
Visit the APOD - The Witch Head Nebula web site
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