21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 19, Problem 11QP
To determine
The correct option.
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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.
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.
If our universe is expanding, what are the implications for the separation between two stars within our galaxy?
A.
The two stars are moving farther apart.
B.
The two stars are moving closer together.
C.
The distance between the two stars is unaffected.
D.
The question is impossible to answer without more information.
Chapter 19 Solutions
21st Century Astronomy
Ch. 19.1 - Prob. 19.1ACYUCh. 19.1 - Prob. 19.1BCYUCh. 19.2 - Prob. 19.2CYUCh. 19.3 - Prob. 19.3CYUCh. 19.4 - Prob. 19.4CYUCh. 19 - Prob. 1QPCh. 19 - Prob. 2QPCh. 19 - Prob. 3QPCh. 19 - Prob. 4QPCh. 19 - Prob. 5QP
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- 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.arrow_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 first stars to form in our galaxy a. had circular orbits. b. had highly elliptical orbits. c. were population I stars. d. all had orbits in the same plane. e. formed the galactic clusters we see today.arrow_forward
- The sun is about 8 kpc from the center of the galaxy. A kpc or kiloparsec is equal to a. 10 parsecs. b. 100 parsecs. c. 1,000,000 parsecs d. 1,000,000,000 parsecs. e. none of the above.arrow_forwardThe age of the Milky Way Galaxy has been estimated to be at least 13 billion years based on a. observations of globular clusters. b. observations of open clusters. c. 21-cm radiation from HI regions. d. the rotation curve of the galaxy. e. the energy produced by Sagittarius A*.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_forward
- The fact that many radio lobes emit less intensely on the side of the galaxy facing away from Earth suggests that a. they are formed by material falling into the galaxy. b. they are powered by black body radiation. c. they are excited by radiation from nearby galaxies. d. they are powered by the rapid rotation of the galaxy. e. they are created by jets of high-speed matter in magnetic fields, which tend to emit photons in the direction they are moving.arrow_forwardThe supermassive black hole at the center of a galaxy has a mass of 6.5 billion solar masses. If we assume that it is a Schwarzschild black hole, what is the radius of this black hole? A. 18 light hours B. 20 light hours C. 16 light hours D. 14 light hours Is the answer A? S. radius = 3 x 6.5 x 109 x 9.26567-10 = 18.1 light hours Thanks!arrow_forwardAn astronomer observed the motions of some galaxies. Based on his observations, he made the following statements. Which one of them is most likely to be false? Take Hubble's constant to be 67 km/s/Mpc. A. A galaxy observed to be moving away from us at a speed of 70 km/s is at a distance of about 1 Mpc from us. B. A galaxy observed to be moving away from us at a speed of 700 km/s is at a distance of about 10 Mpc from us. C. A galaxy observed to be moving away from us at a speed of 7000 km/s is at a distance of about 100 Mpc from us. D. A galaxy observed to be moving away from us at a speed of 70000 km/s is at a distance of about 1 Gpc from us. Is the answer D? Thank you!arrow_forward
- Early astronomers thought that galaxies were single stars. Why was this mistake easy to make? A. Galaxies are so far away that they look like a single star. B. Galaxies are made of stars that you can only see one at a time. C. Light from galaxies collects into a single beam. D. Earth is small and galaxies are much larger.arrow_forwardThe Sun is located in a. the center of the Milky Way Galaxy b. the bulge of the Milky Way Galaxy c. the halo of the Milky Way Galaxy d. the disk of the Milky Way Galaxyarrow_forwardAccording to the Hubble law, if Galaxy A is 10 times more distant than Galaxy B, then Galaxy A is a. receding 10 times faster than Galaxy B. b. approaching 10 times faster than Galaxy B. c. receding 100 times faster than Galaxy B. d. approaching 100 times faster than Galaxy B.arrow_forward
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