Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Question
Chapter 22, Problem 19Q
To determine
To explain: The difference between the orbits of stars in the galactic disk and the orbits of planets in our solar system. Also, discuss how this difference determines the distribution of matter in the galaxy.
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Let us assume that our galaxy consists of 2.5 × 1011 stars each of one solar mass. How long will a star at a distance of 50,000 ly from the galactic centre take to complete one revolution ? Take the diameter of the Milky Way to be 105 light year.
Chapter 22 Solutions
Universe
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- How does the presence of an active galactic nucleus in a starburst galaxy affect the starburst process?arrow_forwardWhat evidence can you give that we live in a galaxy?arrow_forwardSuppose the stars in an elliptical galaxy all formed within a few million years shortly after the universe began. Suppose these stars have a range of masses, just as the stars in our own galaxy do. How would the color of the elliptical change over the next several billion years? How would its luminosity change? Why?arrow_forward
- Why does star formation occur primarily in the disk of the Galaxy?arrow_forwardWhy didnt astronomers before Shapley realize how large our Galaxy is?arrow_forwardSuppose three stars lie in the disk of the Galaxy at distances of 20,000 light-years, 25,000 light-years, and 30,000 light-years from the galactic center, and suppose that right now all three are lined up in such a way that it is possible to draw a straight line through them and on to the center of the Galaxy. How will the relative positions of these three stars change with time? Assume that their orbits are all circular and lie in the plane of the disk.arrow_forward
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