UNIVERSE (LOOSELEAF):STARS+GALAXIES
6th Edition
ISBN: 9781319115043
Author: Freedman
Publisher: MAC HIGHER
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Question
Chapter 23, Problem 37Q
To determine
The reason that giant elliptical galaxies dominate rich clusters but not poor clusters.
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how might you be misled if you studied only the brightest galaxies in a cluster?
why are the shells visible around some elliptical galaxies significant?
Globular clusters revolve around the Galaxy in highly elliptical orbits. Where would you expect the clusters to spend most of their time? (Think of Kepler’s laws.) At any given time, would you expect most globular clusters to be moving at high or low speeds with respect to the center of the Galaxy? Why? (If you would like to learn more about globular clusters, read Section 22.2 of the book, though it is not necessary to answer this question)
Chapter 23 Solutions
UNIVERSE (LOOSELEAF):STARS+GALAXIES
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- What kinds of objects lie in the halo of a spiral galaxy? Globular clusters O and B stars Open clusters All typical components of a spiral galaxy (gas, dust, star clusters, O and B stars) Gas and dustarrow_forwardring galaxies often have nearby companions. What does that suggest?arrow_forwardWhy does star formation occur primarily in the disk of the Galaxy?arrow_forward
- Describe what a typical star in the Galaxy would be like compared to the Sun.arrow_forwardIf we now realize dwarf ellipticals are the most common type of galaxy, why did they escape our notice for so long?arrow_forwardCould the Milky Way ever become an active galaxy? Is it likely to ever be as luminous as a quasar?arrow_forward
- What does it mean if one elliptical galaxy has broader spectrum lines than another elliptical galaxy?arrow_forwardConsider the following five kinds of objects: open cluster, giant molecular cloud, globular cluster, group of O and B stars, and planetary nebulae. A. Which occur only in spiral arms? B. Which occur only in the parts of the Galaxy other than the spiral arms? C. Which are thought to be very young? D. Which are thought to be very old? E. Which have the hottest stars?arrow_forwardWhich is redder-a spiral galaxy or an elliptical galaxy?arrow_forward
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