Chapter 19 Reading Quiz Clickers. The Cosmic Perspective Seventh Edition. Our Galaxy Pearson Education, Inc.

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1 Reading Quiz Clickers The Cosmic Perspective Seventh Edition Our Galaxy

2 19.1 The Milky Way Revealed What does our galaxy look like? How do stars orbit in our galaxy?

3 Where are globular clusters located in the Milky Way? a) disk b) central bulge c) halo d) spiral arms

4 Where are globular clusters located in the Milky Way? a) disk b) central bulge c) halo d) spiral arms

5 Where is the Sun located in the Milky Way? a) about 27,000 light-years from the center, in the disk b) about 27,000 light-years from the center, in the halo c) about 100,000 light-years from the center, in the disk d) about 8000 light-years from the center, in the disk e) about 1000 light-years from the center, in the halo

6 Where is the Sun located in the Milky Way? a) about 27,000 light-years from the center, in the disk b) about 27,000 light-years from the center, in the halo c) about 100,000 light-years from the center, in the disk d) about 8000 light-years from the center, in the disk e) about 1000 light-years from the center, in the halo

7 How thick is the disk of the Milky Way? a) 100 light-years b) 1000 light-years c) 5000 light-years d) 20,000 light-years e) 35,000 light-years

8 How thick is the disk of the Milky Way? a) 100 light-years b) 1000 light-years c) 5000 light-years d) 20,000 light-years e) 35,000 light-years

9 How long does it take the Sun to complete one orbit of the Milky Way? a) 100,000 years b) 12 million years c) 230 million years d) 1.2 billion years

10 How long does it take the Sun to complete one orbit of the Milky Way? a) 100,000 years b) 12 million years c) 230 million years d) 1.2 billion years

11 19.2 Galactic Recycling How is gas recycled in our galaxy? Where do stars tend to form in our galaxy?

12 What produces the 21-centimeter emission line? a) supernova remnants b) atomic hydrogen gas c) planetary nebulae d) CO in giant molecular clouds e) super bubble emissions

13 What produces the 21-centimeter emission line? a) supernova remnants b) atomic hydrogen gas c) planetary nebulae d) CO in giant molecular clouds e) super bubble emissions

14 What creates hot bubbles in the Milky Way? a) radiation from the supermassive black hole at the galactic center b) radiation from dense globular clusters in the galactic halo c) radiation from supernova explosions d) radiation from black hole accretion disks e) all of the above

15 What creates hot bubbles in the Milky Way? a) radiation from the supermassive black hole at the galactic center b) radiation from dense globular clusters in the galactic halo c) radiation from supernova explosions d) radiation from black hole accretion disks e) all of the above

16 What is the star-gas-star cycle? a) the recycling of stellar material from stars into the interstellar medium which then forms new stars b) the transfer of material from one star through an accretion disk to another star in a binary star system c) the shockwave from a supernova triggering gas clouds to condense into new stars d) the transfer of gas from stars in one part of the galaxy through the halo to other parts of the galaxy via galactic fountains

17 What is the star-gas-star cycle? a) the recycling of stellar material from stars into the interstellar medium which then forms new stars b) the transfer of material from one star through an accretion disk to another star in a binary star system c) the shockwave from a supernova triggering gas clouds to condense into new stars d) the transfer of gas from stars in one part of the galaxy through the halo to other parts of the galaxy via galactic fountains

18 Which of the following regions of interstellar gas have the lowest temperatures? a) hot bubbles b) warm atomic gas c) cool atomic clouds d) molecular clouds e) molecular cloud cores

19 Which of the following regions of interstellar gas have the lowest temperatures? a) hot bubbles b) warm atomic gas c) cool atomic clouds d) molecular clouds e) molecular cloud cores

20 Which of the following regions of interstellar gas have the lowest densities? a) hot bubbles b) warm atomic gas c) cool atomic clouds d) molecular clouds e) molecular cloud cores

21 Which of the following regions of interstellar gas have the lowest densities? a) hot bubbles b) warm atomic gas c) cool atomic clouds d) molecular clouds e) molecular cloud cores

22 In what part of the spectrum are hot gas bubbles visible? a) 21-centimeter emission (radio) b) near-infrared c) gamma-rays d) ultraviolet e) X-rays

23 In what part of the spectrum are hot gas bubbles visible? a) 21-centimeter emission (radio) b) near-infrared c) gamma-rays d) ultraviolet e) X-rays

24 What gives reflection nebulae their blue color? a) the blue light from nearby hot stars b) preferential scattering of blue light from dust grains c) emission lines in the blue part of the spectrum from atomic hydrogen d) emission lines in the blue part of the spectrum from molecular hydrogen

25 What gives reflection nebulae their blue color? a) the blue light from nearby hot stars b) preferential scattering of blue light from dust grains c) emission lines in the blue part of the spectrum from atomic hydrogen d) emission lines in the blue part of the spectrum from molecular hydrogen

26 Where are most star-forming regions in the Milky Way? a) the central bulge b) the halo c) the spiral arms d) the regions between the spiral arms e) Star formation happens at roughly the same rate in all regions of the Milky Way.

27 Where are most star-forming regions in the Milky Way? a) the central bulge b) the halo c) the spiral arms d) the regions between the spiral arms e) Star formation happens at roughly the same rate in all regions of the Milky Way.

28 19.3 The History of the Milky Way What clues to our galaxy's history do halo stars hold? How did our galaxy form?

29 Which of the following is not a difference between the disk population and the spheroidal population? a) The disk population contains younger stars than the spheroidal population. b) The spheroidal population stars are low-mass stars. c) The spheroidal population stars have much lower fractions of heavy elements than the disk population stars. d) Disk population stars are predominantly in clusters while the spheroidal population are primarily alone or in binary systems. e) none of the above (all are true)

30 Which of the following is not a difference between the disk population and the spheroidal population? a) The disk population contains younger stars than the spheroidal population. b) The spheroidal population stars are low-mass stars. c) The spheroidal population stars have much lower fractions of heavy elements than the disk population stars. d) Disk population stars are predominantly in clusters while the spheroidal population are primarily alone or in binary systems. e) none of the above (all are true)

31 Where did the oldest stars in the Milky Way form? a) in the protogalactic cloud b) in the central bulge c) in spiral arms d) in the disk, but not in the spiral arms

32 Where did the oldest stars in the Milky Way form? a) in the protogalactic cloud b) in the central bulge c) in spiral arms d) in the disk, but not in the spiral arms

33 How many dwarf galaxies are in the vicinity of the Milky Way? a) 0 b) 1 c) 2 d) 3 e) 4

34 How many dwarf galaxies are in the vicinity of the Milky Way? a) 0 b) 1 c) 2 d) 3 e) 4

35 19.4 The Mysterious Galactic Center What lies in the center of our galaxy?

36 What is the mass of the object at the center of the Milky Way? a) 40,000 solar masses b) 300,000 solar masses c) 3 million solar masses d) 40 million solar masses e) 300 million solar masses

37 What is the mass of the object at the center of the Milky Way? a) 40,000 solar masses b) 300,000 solar masses c) 3 million solar masses d) 40 million solar masses e) 300 million solar masses

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