Exam 3 Spring 2000 Practice Test 1 - Copy

Exam 3 Spring 2000 Practice Test 1 - Copy - Many of these...

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Many of these questions will appear in their original form, as given here, but most will not. You are forewarned not to simply memorize the answers. 1) How does the interstellar medium obscure our view of most of the galaxy? A) It reflects most light from far distances of the galaxy away from our line of sight. B) It absorbs visible, ultraviolet, and some infrared light. C) It absorbs all wavelengths of light. D) It produces so much visible light that it is opaque and blocks our view of anything beyond it. E) All of the above. 2) Harlow Shapley concluded that the Sun was not in the center of the Milky Way Galaxy by A) mapping the distribution of stars in the galaxy. B) looking at the shape of the "milky band" across the sky. C) mapping the distribution of globular clusters in the galaxy. D) mapping the distribution of gas clouds in the spiral arms. E) looking at other nearby spiral galaxies. 3) Where are most heavy elements made? A) in stars and supernovae B) in the interstellar medium C) in the Big Bang, when the universe first began D) none of the above E) all of the above 4) What produces the 21-cm line that we use to map out the Milky Way Galaxy? A) atomic hydrogen B) molecular hydrogen C) ionized hydrogen D) helium E) carbon monoxide 5) Compared with our Sun, most stars in the halo are A) young, red, and dim and have fewer heavy elements. B) old, red, and dim and have much more heavy element material. C) young, blue, and bright and have much more heavy element material. D) old, red, and bright and have fewer heavy elements. E) old, red, and dim and have fewer heavy elements. 6) What kinds of objects lie in the halo of our galaxy? A) globular clusters B) gas and dust C) open clusters D) O and B stars E) all of the above 7) What kinds of objects lie in the disk of our galaxy? A) open clusters B) old K and M stars C) gas and dust D) O and B stars E) all of the above 8) Compared with stars in the disk, orbits of stars in the halo A) are elliptical, with random orientation. B) are relatively uniform to each other. C) are elliptical but orbiting in the same direction. D) do not have to be around the galactic center. E) do not have to pass through the plane of the galaxy. 9) Why do we believe 90% of the mass of the Milky Way is in the form of dark matter? A) Our view of distant galaxies is sometimes obscured by dark blotches in the sky, and we believe these blotches are dark matter located in the halo. B) Although dark matter emits no visible light, it can be seen with radio wavelengths, and such
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observations confirm that the halo is full of this material. C) Theoretical models of galaxy formation suggest that a galaxy cannot form unless it has at least 10 times as much matter as we see in the Milky Way disk, suggesting that the halo is full of dark matter. D) The orbital speeds of stars far from the galactic center are surprisingly high, suggesting that
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Exam 3 Spring 2000 Practice Test 1 - Copy - Many of these...

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