astro-qs7.pdf - Question Set#7(ASTR/Coleman NAME(The first...

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Question Set #7 (ASTR/Coleman) NAME________________________________ (The first 10 questions are 7 points each. The rest are 6 points each). See sections 13-8 to 13-16 in Chapter 13 of your textbook. Answer these questions: 1. Even though the “spiral arms” of a galaxy produce over half the light of the galaxy, about how much percent more stars do the spiral arms have compared to the areas between the arms? 2. What type of stars do elliptical galaxies primarily contain? 3. A galaxy may show a huge burst of new star formation, likely but not necessarily due to the collision or close passage of another galaxy. What type of galaxy is this called? 4. The fact that galaxies are moving much faster than expected inside a cluster of galaxies provides evidence for the existence of what type of material? See sections 13-17 to 13-18. Answer these questions: 5. There are types of object in space that always have the same luminosity (“absolute magnitude”) . We can judge distances by how faint or bright they appear from Earth. What is the general term for these? 6. (a) Vesto Slipher in the early 1900’s noticed that the light of galaxies is shifted toward what color?
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