Astronomy

1 The Milky Way is simply our edge-on view of our home Galaxy.

            True

2. The Earth lies close to the center of the Galaxy.

            False

3. A pulsating variable star with a period of 10 days would be a Cepheid.

            True

4. Shapley found the Sun is located about half way out the disc from the center of the disk of the Galaxy.

            True

5. The part of the Milky Way we are most familiar with is the:

  

1. Corona

  

2. Galactic Disk

3. Halo

  

 4. Galactic Bulge

  

5. Galactic Center

  

 

  6. The period-luminosity relation is critical in finding distances with

1. RR Lyrae stars.

2. Trigonometric parallaxes.

3. Spectroscopic parallaxes.

 4. Cepheid variables.

5. Pulsars.

7. Galactic disks appear blue because

 1. They contain no G, K, or M dwarfs.

  

2. They contain only blue reflection nebula

3. Dust obscures the longer, red, wavelengths.

  

            4. O and B blue giants are much brighter than G, K, or  M dwarfs.

  

5. Dark matter gravitationally shifts all wavelengths towards the blue.

  

 

 8. The RR Lyrae stars all have periods of

1. Less than a second.

  

 

            2. Several minutes.

  

 

3. Several hours.

  

            4. Several days.

  

 

            5. Several weeks.

 

9. A star in the instability strip of the H-R diagram would

            1. Vary in both temperature and radius.

  

 

            2. Explode as a Type I supernova.

  

 

3. Vary in temperature and brightness, but not in radius.

  

 

4. Vary in brightness with an irregular pattern.

  

 

5. Vary in temperature and radius, but not in brightness.

  

 

10. The period-luminosity relation was discovered in 1908 by

            1. William Herschel.

  

 

 2. Henrietta Leavitt.

  

 

3. Harlow Shapley.

  

 

4. Heber Curtiss.

  

 

5. Edwin Hubble.

  

 

11. In our vicinity, the galactic disk is about 100 times wider than it is thick.

            True

12. It is harder to map the structure of the Milky Way as a whole in visible light than with any    other form of electromagnetic radiation.

            True

13. The rotation curve for our Galaxy shows stars beyond the Sun moving slower than expected.

False

14. The core of the Milky Way, Sagittarius A, is a strong radio source in the sky.

            True

 15. What is one of the differences between Cepheids and RR Lyrae variables?

1. Cepheids are giants, but RR Lyrae stars are still on the main sequence.

  

 

 2. All Cepheids have the same brightness, but RR Lyre stars vary greatly in luminosity.

  

 

 3. The period-luminosity relation holds only for RR Lyrae stars.

  

 

4. The pulsations of RR Lyrae stars are much less regular than those of Cepheid’s.

5. The RR Lyrae stars have much shorter periods than Cepheids.

  

16. Most of the new star formation in the Galaxy is found in the

1. Halo

 

2. Spiral arms

   

 

3. Bulge

  

 

4. Galactic center

 

 

5. Globular clusters

  

 

17. Matter belonging to the Galaxy can be traced out to ________ from the center.

1. 5 kpc

  

 

2. 8 kpc

  

 

3. 15 kpc

  

 

4. 50 kpc

  

 

5. 200 kpc

  

 

 18. Which of these objects have not been found in the Galactic Halo?

            1. RR Lyrae variables

  

 

2. Planetary nebulae

  

 

3. Emission nebulae

  

 

4. Population II stars

  

 

5. Globular clusters

 

 

19. From the Sun, the distance to the Galactic Center is about

            1. 8 pc

 

 

2.8000 pc                   

   

 

             

3.100,000 pc

  

 

4.225 million Pc

  

 

5.1.5 Pc

  

 

20. Detailed measurements of the disk and central bulge region of our Galaxy suggest our Milky Way is a

1. Normal spiral galaxy.

  

 

2. barred spiral galaxy.

  

 

3. Very flat elliptical galaxy.

  

 

4. Very dusty irregular galaxy.

  

 

5. Quasar.