Galaxies and Beyond – Test Review (Chps 19,20,21,23)

CHAPTER 19

1.      See Fig 19.1 on page 593

3.   bulge & halo – elliptical paths; relatively random orientations

      Disk – orbit in plane of disk; oscillations perpendicular to plane, like a merry-go-round

9.  electrons, protons, nuclei from supernovae

CHAPTER 20

2.     Spiral, elliptical, irregular

7.     An object for which we know its true luminosity.  We can measure its distance by using the distance-luminosity relationship.

CHAPTER 21

23.  c                                      24. b                                      29. c

CHAPTER 22 (Skip for Spring 2011)

27.  c                          28.  a                          31.  c                          36. c

 CHAPTER 23

        30.  c