Section 12.B

Question 1

1. Identify the competing forces that are equal when the star maintains a constant size

Answer 1

pressure and the outflow of energy produced

by nuclear fusion compete against the inward force of gravity

Question 2

2. Outer portions of most stars are ________ because gas there never seeps deeply enough to get to the super-hot core.

Answer 2

never burnt

Question 3

5. Although the surface of a star expands to become a red giant, remember that the core has been actually ______.

Answer 3

contracting

Question 4

6. When a red giant expands, its outer layers cool down. Despite that, the star as a whole looks brighter to distant observers. This is because of the large size it now has, which represents a___________

Answer 4

huge increase in surface area out from which light can be emitted.

Question 5

7. Recognize which stages come late in a star’s life ……….

Answer 5

1. subgiant
2. red giant branch
3. horizontal branch
4. asymptotic giant branch

Question 6

8. Always remember: when something contracts it heats up and spins _________

 And when something expands it cools and spins slower.

Answer 6

-(faster? Or slower?)