1. What part of the Milky Way Galaxy is composed of globular clusters?

2. What part of the Milky Way Galaxy is composed of spiral arms?

3. How far is the sun from the center of the galaxy in the disk?

4. How old is the Galaxy?

14 billion years

5. What types of stars are found in the disk?

6. What types of stars are found in the halo?

6. What types of stars are found in the halo?

7. What types are found in the bulge?

8. What is the name of the arm that the sun lies on?

9. What do the spiral arms contain?

10. What is a galactic rotation and how long is suns galactic year?

11. What is in the core or center of entire galaxy?

12. What are the most visible parts of the halo?

13. How is the orbit of the clusters?

Elliptical- used to determine mass of galaxy!!

14. What did the Curtis-Shapely Debate argue?

15. What was believed after debate of the state?

16. How did Hubble settle the debate?

17. What is the period of the star RR Lyrae (bright and dims)?

18. What is a Cepheid Variable?

19. What does type I contain?

20. What does type II contain?

21. Why do they appear to blink?

22. Where are these stars located on the HR Diagram?

23. Up to how many galaxies have been found to be in a cluster?

24. How does a galaxy become elliptical?

25. What is the most common type of elliptical galaxy?

26. How do spiral galaxies form?

27. What kind of galaxy has no arms?

28.  What law states that the further a galaxy is from us the faster its observed recession speed is

29. How is recession speed measured?

30. What tells us the rate at which the universe is expanding? (slope)

31. How many galaxies does our own cluster contain?

32. What is the nearest cluster named- which we are being drawn towards b/c of large mass?

33. What percent of Universe is dark matter?

34. What are large regions of of empty spaces b/w filaments containing few or no galaxies?

35. What type of peculiar galaxy is spiral with really bright nucleus?

36. What are the most distant objects with very broad emission lines and very active nucleus with jets or material shooting out?

37. What is the age characteristic of Quasars? How do we know?

38. What is the central source of a quasar that emits strong radio emission?

39. What may produce the power of quasars by converting gravitational energy to radiation?

40.  How do we know a quasar is present since we can’t see the host?

41. What gravitational lens was actually one object but appeared to have 5 identical dots ?

42. What is the study of the universe’s nature and evolution?

43. What type of geometry says that parallel lines stay parallel?

44.  What is the density needed to close or halt expansion of the universe?

45. How much radiation does the Big Bang theory predict to be left over throughout the universe?

46. What event started the universe that cannot be explained by physics?

47. What forces bind atoms together?

48. Who was able to combine both of the above together making them consistent?