21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 23, Problem 11QP
To determine
The origin of the elliptical galaxies.
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Through the use of various measurement techniques, it has been found that most galaxies are rapidly receding (moving away) from the Milky Way, and in fact, galaxies in distant superclusters are moving away from us more rapidly than nearby superclusters. This recessional motion is present throughout the Universe and is called the
We 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 center
Astronomers estimate the mass of the stars in a certain galaxy to be about 3.040 kg, and the total mass of this galaxy to be about 1.241 kg. The amount of the galaxy's mass is made up of dark matter is
percent
Chapter 23 Solutions
21st Century Astronomy
Ch. 23.1 - Prob. 23.1CYUCh. 23.2 - Prob. 23.2CYUCh. 23.3 - Prob. 23.3CYUCh. 23.4 - Prob. 23.4CYUCh. 23 - Prob. 1QPCh. 23 - Prob. 2QPCh. 23 - Prob. 3QPCh. 23 - Prob. 4QPCh. 23 - Prob. 5QPCh. 23 - Prob. 6QP
Ch. 23 - Prob. 7QPCh. 23 - Prob. 8QPCh. 23 - Prob. 9QPCh. 23 - Prob. 10QPCh. 23 - Prob. 11QPCh. 23 - Prob. 12QPCh. 23 - Prob. 13QPCh. 23 - Prob. 14QPCh. 23 - Prob. 15QPCh. 23 - Prob. 16QPCh. 23 - Prob. 17QPCh. 23 - Prob. 18QPCh. 23 - Prob. 19QPCh. 23 - Prob. 20QPCh. 23 - Prob. 21QPCh. 23 - Prob. 22QPCh. 23 - Prob. 23QPCh. 23 - Prob. 24QPCh. 23 - Prob. 25QPCh. 23 - Prob. 26QPCh. 23 - Prob. 27QPCh. 23 - Prob. 28QPCh. 23 - Prob. 29QPCh. 23 - Prob. 30QPCh. 23 - Prob. 31QPCh. 23 - Prob. 32QPCh. 23 - Prob. 33QPCh. 23 - Prob. 36QPCh. 23 - Prob. 37QPCh. 23 - Prob. 38QPCh. 23 - Prob. 45QP
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- The 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_forwardBecause the galaxies are moving away from us, the light they emit is shifted toward the shorter, blue wavelengths. is shifted toward the longer, red wavelengths. is of the same wavelength it would be if they were at rest relative to the earth. arrives with increased intensityarrow_forwardWhich of the following might you expect to be an additional consequence of the fact that galaxies contain more mass than expected?A. The gravitational force between galaxies is greater than expected.B. Galaxies appear less bright than expected.C. Galaxies are farther away than expected.D. There are more galaxies than expected.arrow_forward
- When two galaxies collide, the stars inside them are not likely to be much affected, because the __________ stars is so large compared to their diameters. However, the _______ of stars and gas can be changed, altering the appearance of the galaxies. Astronomers have determined that such collisions are seen more often in ____________. When two galaxies of roughly equal size collide, astronomers call it a _______ of galaxies; but when a small galaxy collides with a much larger one, the process is called ___________. When a galaxy has a significant amount of its interstellar gas compressed by a collision, leading to the birth of many new stars, astronomers call it a __________ galaxy.arrow_forwardDescribe the organization of galaxies into groupings, from the Local Group to superclusters.arrow_forwardDescribe the main distinguishing features of spiral, elliptical, and irregular galaxies.arrow_forward
- Starting with the determination of the size of Earth, outline a sequence of steps necessary to obtain the distance to a remote cluster of galaxies. (Hint: Review the chapter on Celestial Distances.)arrow_forwardWhat do we now understand to be the primary difference between normal galaxies and active galaxies?arrow_forwardWhy did it take so long for the existence of other galaxies to be established?arrow_forward
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