21ST CENTURY ASTR.:STARS..(LL)-PACKAGE
6th Edition
ISBN: 9780393448450
Author: Kay
Publisher: NORTON
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Chapter 20, Problem 4QP
To determine
The magnetic field of the Milky Way has been detected.
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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.
Galaxy seeds around which galaxies, clusters, and walls grew may have been
a.
caused by hot dark matter.
b.
caused by baryons.
c.
the result of the separation of the electromagnetic and weak forces.
d.
the result of freezing water molecules shortly after the universe became transparent to photons.
e.
caused by microscopic random fluctuations in the infant universe.
What happens when galaxies collide?
A. Star collisions will be rare but the shapes of the galaxies will be largely distorted.
B. The shapes of the galaxies will be largely distorted and many of the stars of one galaxy will collide with stars of the other galaxy.
C. The shapes of the galaxies will be distorted and many stars will collide with stars of the other galaxy, as well as with other stars in the same galaxy.
D. Star collisions will be rare and the two galaxies will just pass through each other without any changes.
Is the answer A? Thank you!
Chapter 20 Solutions
21ST CENTURY ASTR.:STARS..(LL)-PACKAGE
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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- Eruptions of supermassive black holes in quasars may have been caused by a. novae. b. collisions or mergers with other galaxies. c. depleting all the material from the accretion disk. d. supernovae.arrow_forwardThe 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.arrow_forwardQuasi-stellar objects were first detected as a. double-lobed spiral galaxies. b. faint points of light with peculiar emission spectra. c. large regions of X-ray emissions. d. starlike objects with normal stellar emission spectra. e. galaxies with normal stellar emission spectra.arrow_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_forwardIf 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.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_forward
- The age of the universe can be determined if a. the universe is flat. b. the amount of dark matter in the universe can be accurately determined. c. the rate of recession of the galaxies in the Local Group can be accurately determined. d. the temperature of the cosmic background radiation can be accurately determined. e. the Hubble constant and density of the universe can be accurately determined.arrow_forwardWe know that dark matter must exist in galaxies. If not, many of the stars in a galaxy would ... a.Expand and go supernova due to the expansion of the Universe b.Fly away from the galaxy because the stars’ velocities are so large, and the galaxy would not have enough gravity to hold onto them c.Orbit the center of the galaxy normally d.Spiral in toward the center of the galaxy because most of the galaxy’s mass would be toward the centerarrow_forwardThe theory that waves of compression move around the galaxy triggering star formation is called a. the flocculent theory. b. the spiral compression theory. c. the density wave theory. d. the differential rotation theory. e. none of the above.arrow_forward
- The big bang happened a. in the Hyades cluster. b. in the Virgo cluster. c. in the Sagittarius spiral arm. d. in the Andromeda Galaxy. e. in all of these locations.arrow_forwardThe 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 evidence leads modern astronomers to conclude that at the cores of active galaxies are supermassive black holes with masses as high as a. ten solar masses. b. a thousand solar masses. c. a million solar masses. d. a billion solar masses.arrow_forward
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