Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 23, Problem 38Q
To determine
The observations that can be done to search for as-yet-undiscovered galaxies in the local group.
The reason for such galaxies to remain undiscovered till now.
The part of the sky, in which these galaxies may be located.
The type of observations that might reveal these galaxies.
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Students have asked these similar questions
) what are some fundamental properties of late type galaxies that our theories of galaxy formation must reproduce?
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Explain how the temperature of hot gas can be used to find out about the gravitational pull of a galaxy.
propose an explanation for the lack of gas, dust, and young stars in elliptical
galaxies.
Chapter 23 Solutions
Universe: Stars And Galaxies
Ch. 23 - Prob. 1QCh. 23 - Prob. 2QCh. 23 - Prob. 3QCh. 23 - Prob. 4QCh. 23 - Prob. 5QCh. 23 - Prob. 6QCh. 23 - Prob. 7QCh. 23 - Prob. 8QCh. 23 - Prob. 9QCh. 23 - Prob. 10Q
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- What are the two best ways to measure the distance to a distant, isolated spiral galaxy, and how would it be measured?arrow_forwardAstronomers have been making maps by observing a slice of the universe and seeing where the galaxies lie within that slice. If the universe is isotropic and homogeneous, why do they need more than one slice? Suppose they now want to make each slice extend farther into the universe. What do they need to do?arrow_forwardCan an elliptical galaxy evolve into a spiral? Explain your answer. Can a spiral turn into an elliptical? How?arrow_forward
- What are the two best ways to measure the distance to a nearby spiral galaxy, and how would it be measured?arrow_forwardSuppose the Milky Way Galaxy were truly isolated and that no other galaxies existed within 100 million light-years. Suppose that galaxies were observed in larger numbers at distances greater than 100 million light-years. Why would it be more difficult to determine accurate distances to those galaxies than if there were also galaxies relatively close by?arrow_forwardWhat do we now understand to be the primary difference between normal galaxies and active galaxies?arrow_forward
- Describe the evolution of an elliptical galaxy. How does the evolution of a spiral galaxy differ from that of an elliptical?arrow_forwardThe first clue that the Galaxy contains a lot of dark matter was the observation that the orbital velocities of stars did not decreases with increasing distance from the center of the Galaxy. Construct a rotation curve for the solar system by using the orbital velocities of the planets, which can be found in Appendix F. How does this curve differ from the rotation curve for the Galaxy? What does it tell you about where most of the mass in the solar system is concentrated?arrow_forwardOne way to calculate the size and shape of the Galaxy is to estimate the distances to faint stars just from their observed apparent brightnesses and to note the distance at which stars are no longer observable. The first astronomers to try this experiment did not know that starlight is dimmed by interstellar dust. Their estimates of the size of the Galaxy were much too small. Explain why.arrow_forward
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