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M3_97 - ASTRONOMY 100 Dr Werner Dppen 2 pm 17 November 1997...

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1 ASTRONOMY 100 Dr. Werner Däppen MIDTERM 3 ______________ 2 pm, 17 November 1997 Exam Number Name (Please Print) 1. Which of the following best describes the size-and-distance relationship of our Sun and the nearest star? a) Two beachballs separated by 10 city blocks. b) Two grains of sand separated by 100 light years. c) Two golfballs separated by 1,000 kilometers. d) Two baseballs separated by 10,000 yards. 2. The principal benefit of binary stars for astronomy is that they allow us the determination of stellar _____________. 3. In order to understand the existence of iron on Earth, scientists think that 4. Why are star clusters almost ideal "laboratories" for stellar studies? a) The combined light of the stars makes them easier to see. b) Like our Sun, stars in clusters are always located in the plane of the Milky Way Galaxy. c) Stars in clusters have the same age, similar composition, and lie at approximately the same distance away. d) Stars in clusters are all relatively young and therefore shine brightly. 5. A nearby star has a parallax of 0.2 arc seconds. What is its distance?
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2 6. Compared to the size of the Sun, in what range of sizes are most stars found? Give the most appropriate range. a) 0.1 to 1.0 solar radii b) 0.5 to 5.0 solar radii c) 1 to 100 solar radii d) 0.01 to 100 solar radii e) 1 to 10 solar radii 7. What physical property of a star does the spectral type measure? 8. What happens inside an interstellar cloud fragment when it shrinks? 9. If the initial interstellar cloud in star formation has a mass sufficient to form hundreds of stars, how does a single star form from it? a) One star forms at its center and blows the rest of the matter back into space. b) One star forms and the rest of the matter goes into making planets, moons, and other objects of a solar system. c) The cloud fragments into smaller clouds and forms many stars at one time. d) The cloud is disrupted by its own rotation so that it reduces its mass down to that of a typical star.
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