1. July 26, 2004 Exploring the Interstellar Medium Debrief What is the interstellar medium? What is the ISM made of? How dense is the ISM? What causes the colors in the ISM?

2. July 26, 2004 Exploring the Interstellar Medium Debrief Can you explain this image? What causes the blue color? What causes the red? What are the dark regions? What happens to the light of the stars behind the cloud?

3. July 26, 2004 What are the temperatures like in the ISM? What do we know about its heat? What is the difference between heat and temperature? What does it mean for something to be hot? How is matter conserved in the ISM? Exploring the Interstellar Medium Debrief

4. July 26, 2004 Exploring the Interstellar Medium Debrief What is the Local Bubble, and what are some possibilities for how it formed? Are bubbles common in the Galaxy? How do bubbles contribute to the structure of the Galaxy, generally?