1. Chapter 26 Question 48: According to nebular theory, what happens to a nebula as it contracts under the force of gravity? Comment on speed, temperature, and shape.

2. Chapter 26 Question 68: When it comes to celestial bodies, such as planets and stars, why doesn't a larger size necessarily mean a larger mass? Provide an example.

3. Chapter 26 Question 72: Why are many craters evident on the surface of the Moon, but not on the surface of Earth?

4. Chapter 26 Question 94: A meteor is visible only once, but a comet may be visible at regular intervals throughout a lifetime. Why is this?

5. Chapter 27 Question 6: What is the difference between apparent brightness and luminosity? What object used as the comparison point for luminosity

6. Describe how a star forms, or is "born". What process changes a protostar into a full-fledged star?

7. Chapter 27 Question 66: Why do low mass stars live longer than high-mass stars? Don't high mass stars have more "fuel"?

8. Chapter 27 Question 86: A black hole is no more massive than the star from which it collapsed. Why, then, is the gravitation so intense near a black hole?