Name:_____________________________ Date:_____________Period:_____________
Stars, Galaxies and HR Diagrams
Stars
1. What stage do stars form? ______________________
2. What do average stars turn into after they reach the sun's current stage?_______________
3. What type of star will the sun and sun-like stars become after they form another planetary
nebula?_______________________________
4. What do massive stars become as they become older and larger? Give 2
stages_______________________________________
5. What stage do massive stars die? ________________________________________
6. What 2 stages could massive stars go through after they die?
______________________________________
Galaxies
Name each galaxy spiral, elliptical or irregular
7.
_____________________
8.
____________________
9.
___________________
10.
11.
12.
_______________________
____________________
_____________________
13. What type of galaxy is our solar system in? _______________________________
14. What is the name of our galaxy? ___________________________________
15. What type of galaxy has the most mass?_____________________________
HR Diagrams
16. On the HR diagram, where can we find the hottest but dimmest stars?
___________________________________
17. What percentage of stars are in their Main Sequence phase? _______________________
18. How many classes of stars are located on the HR diagram and what are the names?
_______________________________________________________________________
19. What class of star is Rigel? ____________________
20. Name the dimmest star on the diagram: _____________________________________
21. Describe 3 features of the star North Star (Polaris):
____________________________________________________________________________
Universe
22. All of the stars contain helium and ___________________.
a.Methane b. Ammonia c. Hydrogen d. Oxygen
23. Blue stars are the _____________ stars.
a.Coolest b.Hottest
c. Biggest
d. Smallest
24. Compare and contrast what would happen if 2 galaxies collide: _______________________
____________________________________________________________________________
Answer Key
Name:_____________________________ Date:_____________Period:_____________
Stars, Galaxies and HR Diagrams
Stars
1. What stage do stars form? Nebula
2. What do average stars turn into after they reach the sun's current stage? Red Giant
3. What type of star will the sun and sun-like stars become after they form another planetary
nebula? White dwarf
4. What do massive stars become as they become older and larger? Give 2 stages
(Multiple Answers) Red Supergiant, Supernova, Neutron Star, Black hole
5. What stage do massive stars die? Supernova
6. What 2 stages could massive stars go through after they die? Neutron Star and Black Hole
Galaxies
Name each galaxy spiral, elliptical or irregular
7.
8.
Elliptical
10.
9.
Irregular
11.
Irregular
Spiral
12.
Spiral
Elliptical
13. What type of galaxy is our solar system in? Spiral
14. What is the name of our galaxy? Milky Way
15. What type of galaxy has the most mass? Elliptical
HR Diagrams
16. On the HR diagram, where can we find the hottest but dimmest stars? Left and bottom
17. What percentage of stars are in their Main Sequence phase? 95%
18. How many classes of stars are located on the HR diagram and what are the names? 4:
Supergiant, White dwarf, Main Sequence, Giants
19. What class of star is Rigel? Supergiant
20. Name the dimmest star on the diagram: Barnard’s Star
21. Describe 3 features of the star North Star (Polaris): Supergiant, Yellow Color and Bright
Universe
22. All of the stars contain helium and ___________________.
a.Methane b. Ammonia c. Hydrogen d. Oxygen
23. Blue stars are the _____________ stars.
a.Coolest b.Hottest
c. Biggest
d. Smallest
24. Compare and contrast what would happen if 2 galaxies collide: The galaxy would expand
and blow up