Unit 2: The Stars Study Guide
1. How do astronomers develop new theories about the universe?
2. What is a spectroscope?
Use the H-R diagram to help answer questions 3-5.
3. Use the graph (above) and what you learned about stars to fill in the missing information.
Spectral Class
O
Name
Temperature
(K)
B
Blue-white
>25,000
G
Yellowwhite
7,50010,000
4. What stars have the highest absolute magnitude?
5. What stars have the greatest luminosity?
6. What is the difference between a nebula and a galaxy?
7. How does a star’s life cycle begin?
8. How can a star’s life cycle end?
K
red
5,0006,000
3,0005,000
3,000<
9. True or False: A star’s energy comes from nuclear fusion _______
10. True or False: The heaviest element a star can produce is iron. _______
11. True or False: A red giant is a star that started to expand near the end of its life. ________
12. Match the word to where it goes on the electromagnetic spectrum.
13. What happens as a red star runs out of energy?