Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Question
Chapter 14, Problem 9QAP
To determine
The reason that globular clusters are used to find the size of galaxy.
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Students have asked these similar questions
What is the name for the spherical cloud of thinly scattered stars and globular clusters that contain only about 2 percent as many stars as the disk of the galaxy and has very little gas and dust?
a.
the core
b.
the nuclear bulge
c.
the spiral arms
d.
the halo
e.
none of these
Our galaxy is suspected to be surrounded by a galactic corona because the disk of the galaxy
a.
rotates faster than expected in its outer region.
b.
rotates more slowly than expected in its outer region.
c.
rotates faster than expected in its inner region.
d.
rotates more slowly than expected in its inner region.
e.
is much flatter than expected
The traditional theory of the formation of our galaxy CANNOT explain
a.
the existence of the disk of the galaxy.
b.
the fact that the oldest stars in the galaxy are not metal free.
c.
the spherical distribution of the globular clusters.
d.
the difference in metal abundance of the population I and II stars.
e.
the existence of the nuclear bulge.
Chapter 14 Solutions
Understanding Our Universe
Ch. 14.1 - Prob. 14.1CYUCh. 14.2 - Prob. 14.2CYUCh. 14.3 - Prob. 14.3CYUCh. 14.4 - Prob. 14.4CYUCh. 14 - Prob. 1QAPCh. 14 - Prob. 2QAPCh. 14 - Prob. 3QAPCh. 14 - Prob. 4QAPCh. 14 - Prob. 5QAPCh. 14 - Prob. 6QAP
Ch. 14 - Prob. 7QAPCh. 14 - Prob. 8QAPCh. 14 - Prob. 9QAPCh. 14 - Prob. 10QAPCh. 14 - Prob. 11QAPCh. 14 - Prob. 12QAPCh. 14 - Prob. 13QAPCh. 14 - Prob. 14QAPCh. 14 - Prob. 15QAPCh. 14 - Prob. 16QAPCh. 14 - Prob. 17QAPCh. 14 - Prob. 18QAPCh. 14 - Prob. 19QAPCh. 14 - Prob. 20QAPCh. 14 - Prob. 21QAPCh. 14 - Prob. 22QAPCh. 14 - Prob. 23QAPCh. 14 - Prob. 24QAPCh. 14 - Prob. 25QAPCh. 14 - Prob. 27QAPCh. 14 - Prob. 28QAPCh. 14 - Prob. 29QAPCh. 14 - Prob. 30QAPCh. 14 - Prob. 31QAPCh. 14 - Prob. 32QAPCh. 14 - Prob. 33QAPCh. 14 - Prob. 34QAPCh. 14 - Prob. 35QAPCh. 14 - Prob. 36QAPCh. 14 - Prob. 37QAPCh. 14 - Prob. 38QAPCh. 14 - Prob. 39QAPCh. 14 - Prob. 40QAPCh. 14 - Prob. 41QAPCh. 14 - Prob. 43QAPCh. 14 - Prob. 44QAPCh. 14 - Prob. 45QAP
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- In which portion of the spectrum is the core of the galaxy invisible? a. infrared b. visible c. gamma ray d. X ray e. radioarrow_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_forwardIf you want to find a sizeable collection of Population Il stars in the Milky Way Galaxy, where would be a good place to look? A. near the Sun B. in a globular cluster high above the Galaxy's disk C. in the Orion Spur D.on the outer surface of giant molecular clouds E. in an open cluster, especially one with a lot of dust in and around itarrow_forward
- Disk population stars have I. circular orbits in the plane of the galaxy II. randomly tipped, elliptical orbits III. old stars with low metal content IV. young stars with heavy metal content a. I and II b. I and III c. II and III d. II and IV e. I and IVarrow_forwardHalo population stars have I. circular orbits in the plane of the galaxy. II. randomly tipped, elliptical orbits. III. old stars with low metal content. IV. young stars with heavy metal content. a. I and II b. I and III c. II and III d. II and IV e. I and IVarrow_forwardAbsorption lines produced by interstellar gas a. are wider than the lines from stars because the gas is hotter than most stars. b. are more narrow than the lines from stars because the gas has a lower pressure than stars. c. indicate that the interstellar medium contains dust. d. indicate that the interstellar medium is expanding away from the sun. e. indicate nothing; none of the above statements are true.arrow_forward
- The 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_forwardThe first stars to form in our galaxy a. had circular orbits. b. had highly elliptical orbits. c. were population I stars. d. all had orbits in the same plane. e. formed the galactic clusters we see today.arrow_forwardA star at a distance of 50000 light years from the center of a galaxy has an orbital speed of 100 km/s around the galactic center. What is the total mass of the galaxy located at distances smaller than 50000 light years from the center? A. 7.6 ×1010 solar masses B. 4.2 ×1011 solar masses C. 3.5 ×1010 solar masses D. 1.4 ×1011 solar masses Is the answer C? M = (r x v^2) / G = 50000 x 9.46e15 x (100000^2) / 6.67e-11 / 2e30 (the Sun's mass) = 3.55e10 solar massesarrow_forward
- Consider 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_forwardWhat triggers the nucleus of a galaxy into activity? a. a nova explosion b. a type I supernova explosion c. a hypernova explosion d. a type II supernova explosion e. none of the abovearrow_forwarda) Calculate the period of the solar system's orbit around the Milky Way. Assume that we are 8.5 kpc from the galactic center and assume that the mass of the Milky Way interior to our orbit is ~ 10¹¹ solar masses. Alpha Centauri is a multiple star system only 1.34 parsecs away. The apparent magnitudes of the two main stars are: a Cen A: my = +0.01; a Cen B: my = +1.33. b) Calculate the ratio of the flux we receive in the V filter from a Cen A to the flux we receive from a Cen B. c) Calculate the absolute magnitude My of a Cen B.arrow_forward
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