21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Question
Chapter 20, Problem 6QP
To determine
As the time passes, the changes in Large Magellanic Cloud and Small Magellanic Cloud.
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Radio maps of the spiral arms of our galaxy
a.
reveal that our galaxy is a grand design spiral.
b.
map the location of hot O and B stars by the radio radiation they emit.
c.
reveal that the spiral arms are winding up and growing closer together.
d.
reveal that the sun is currently located in the center of a spiral arm.
e.
map the location of dense neutral hydrogen clouds.
Radio maps of our galaxy show spiral arms because
a.
the arms have larger Doppler shifts.
b.
the gas in the spiral arms is very hot.
c.
the dust in spiral arms is denser.
d.
the gas in spiral arms is denser.
e.
the stars in the spiral arms emit most of their energy at radio wavelengths.
The traditional theory states that our galaxy formed
a.
as a large spherical cloud of gas that was rotating very slowly.
b.
from a large cloud of material that broke off from a larger galaxy.
c.
from material that had been ejected in the violent explosion of a dying galaxy.
d.
as a result of mergers between several smaller groups of gas, dust, and stars.
e.
as two massive galaxies collided.
Chapter 20 Solutions
21st Century Astronomy
Ch. 20.1 - Prob. 20.1CYUCh. 20.2 - Prob. 20.2CYUCh. 20.3 - Prob. 20.3CYUCh. 20.4 - Prob. 20.4CYUCh. 20 - Prob. 1QPCh. 20 - Prob. 2QPCh. 20 - Prob. 3QPCh. 20 - Prob. 4QPCh. 20 - Prob. 5QPCh. 20 - Prob. 6QP
Ch. 20 - Prob. 7QPCh. 20 - Prob. 8QPCh. 20 - Prob. 9QPCh. 20 - Prob. 10QPCh. 20 - Prob. 11QPCh. 20 - Prob. 12QPCh. 20 - Prob. 13QPCh. 20 - Prob. 14QPCh. 20 - Prob. 15QPCh. 20 - Prob. 16QPCh. 20 - Prob. 17QPCh. 20 - Prob. 18QPCh. 20 - Prob. 19QPCh. 20 - Prob. 20QPCh. 20 - Prob. 21QPCh. 20 - Prob. 22QPCh. 20 - Prob. 23QPCh. 20 - Prob. 24QPCh. 20 - Prob. 25QPCh. 20 - Prob. 26QPCh. 20 - Prob. 27QPCh. 20 - Prob. 28QPCh. 20 - Prob. 29QPCh. 20 - Prob. 30QPCh. 20 - Prob. 31QPCh. 20 - Prob. 32QPCh. 20 - Prob. 33QPCh. 20 - Prob. 34QPCh. 20 - Prob. 35QPCh. 20 - Prob. 36QPCh. 20 - Prob. 37QPCh. 20 - Prob. 38QPCh. 20 - Prob. 39QPCh. 20 - Prob. 40QPCh. 20 - Prob. 41QPCh. 20 - Prob. 42QPCh. 20 - Prob. 43QPCh. 20 - Prob. 44QPCh. 20 - Prob. 45QP
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- The traditional theory of the formation of our galaxy CANNOT explain a. the existence of the disk of the galaxy. b. the fact that the oldest stars in the galaxy are not metal free. c. the spherical distribution of the globular clusters. d. the difference in metal abundance of the population I and II stars. e. the existence of the nuclear bulge.arrow_forwardAbsorption lines produced by interstellar gas a. are wider than the lines from stars because the gas is hotter than most stars. b. are more narrow than the lines from stars because the gas has a lower pressure than stars. c. indicate that the interstellar medium contains dust. d. indicate that the interstellar medium is expanding away from the sun. e. indicate nothing; none of the above statements are true.arrow_forwardHalo population stars have I. circular orbits in the plane of the galaxy. II. randomly tipped, elliptical orbits. III. old stars with low metal content. IV. young stars with heavy metal content. a. I and II b. I and III c. II and III d. II and IV e. I and IVarrow_forward
- The lower limit of the mass of the galaxy is a. 100 solar masses. b. 100,000 solar masses. c. 100 million solar masses. d. 100 billion solar masses. e. 100 trillion solar masses.arrow_forwardStars have the greatest metal content in which region of the Milky Way Galaxy? a. in the galactic halo b. in the nuclear bulge c. in the disk d. in the core e. in the spherical componentarrow_forwardOur galaxy is suspected to be surrounded by a galactic corona because the disk of the galaxy a. rotates faster than expected in its outer region. b. rotates more slowly than expected in its outer region. c. rotates faster than expected in its inner region. d. rotates more slowly than expected in its inner region. e. is much flatter than expectedarrow_forward
- Disk population stars have I. circular orbits in the plane of the galaxy II. randomly tipped, elliptical orbits III. old stars with low metal content IV. young stars with heavy metal content a. I and II b. I and III c. II and III d. II and IV e. I and IVarrow_forwardIn which portion of the spectrum is the core of the galaxy invisible? a. infrared b. visible c. gamma ray d. X ray e. radioarrow_forwardThe spectra of the cores of Seyfert galaxies contain emission lines of highly ionized atoms that are a. split from the strong electric fields. b. blueshifted. c. split from the strong magnetic fields. d. broadened. e. all of the above.arrow_forward
- Absorption lines produced when starlight travels through the interstellar medium indicate that some components of the interstellar medium are cold and of a very low density because a. the lines are blueshifted. b. the lines are redshifted. c. the lines are extremely broad. d. the lines are extremely narrow. e. the lines are much darker than the stellar lines.arrow_forwardThe approximate diameter of the disk of the Milky Way is a. 8.0 A.U. b. 8.0 light-years. c. 80 light-years. d. 80,000 light-years. e. 80,000,000 light-years.arrow_forwardWhat is the name for the spherical cloud of thinly scattered stars and globular clusters that contain only about 2 percent as many stars as the disk of the galaxy and has very little gas and dust? a. the core b. the nuclear bulge c. the spiral arms d. the halo e. none of thesearrow_forward
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