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PHY 111, Spring, 2006
Week 12
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Main Objectives You should be able to explain what Cepheid
variable stars are and how they are used to find distances.
You should be able to compare and contrast open and globular clusters.
You should be able to discuss:
 | the main parts of our galaxy (galactic disk, galactic plane, nucleus, nuclear bulge, and
halo) |
| the rotation rates of stars in different parts of the galaxy and what we learn from this |
| the basis on which we divide stars into two populations |
You should be able to explain:
| what the missing mass problem is and what possible solutions there are |
| how we determine the mass of a galaxy |
| Why we can see further into the galaxy using radio wavelengths than using visible light |
| why we see the same number of stars when looking toward the galactic center as when
looking away from it |
| what the 21 cm line is and why it is important |
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| Tuesday |
Begin discussion of galaxies by talking about our own galaxy,
the Milky Way. Outside of class: Finish your preparation for the exam. |
| Thursday |
Exam III on Chapters 11-15. Outside of class: Read
Chapter 16 and Ch. 15 Section 9. Complete Chapter 16 review questions 1, 5, 7, 9, and 25
to be turned in next Thursday. |
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