21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Question
Chapter 23, Problem 3QP
To determine
The process of formation of the larger galaxies is same as the formation of which one the celestial body.
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Measured ages of globular clusters and a study of the time required for massive stars to build up the present abundance of heavy elements suggests that the universe is
a.
at least 20 billion years old.
b.
no more than 10 billion years old.
c.
about 14 billion years old.
d.
flat.
e.
closed.
The lower limit of the mass of the galaxy is
a.
100 solar masses.
b.
100,000 solar masses.
c.
100 million solar masses.
d.
100 billion solar masses.
e.
100 trillion solar masses.
The 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.
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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- Eruptions of supermassive black holes in quasars may have been caused by a. novae. b. collisions or mergers with other galaxies. c. depleting all the material from the accretion disk. d. supernovae.arrow_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_forwardThe 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.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 oldest open clusters are a. 3 to 4 billion years old. b. 6 to 7 billion years old. c. 9 to 10 billion years old. d. 12 to 13 billion years old. e. 16 to 17 billion years old.arrow_forwardThe theory that waves of compression move around the galaxy triggering star formation is called a. the flocculent theory. b. the spiral compression theory. c. the density wave theory. d. the differential rotation theory. e. none of the above.arrow_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_forwardThe spectra of the cores of Seyfert galaxies contain emission lines of highly ionized atoms that are a. split from the strong electric fields. b. blueshifted. c. split from the strong magnetic fields. d. broadened. e. all of the above.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_forward
- What happens when galaxies collide? A. Star collisions will be rare but the shapes of the galaxies will be largely distorted. B. The shapes of the galaxies will be largely distorted and many of the stars of one galaxy will collide with stars of the other galaxy. C. The shapes of the galaxies will be distorted and many stars will collide with stars of the other galaxy, as well as with other stars in the same galaxy. D. Star collisions will be rare and the two galaxies will just pass through each other without any changes. Is the answer A? Thank you!arrow_forwardWhat 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 thesearrow_forwardThe sun is about 8 kpc from the center of the galaxy. A kpc or kiloparsec is equal to a. 10 parsecs. b. 100 parsecs. c. 1,000,000 parsecs d. 1,000,000,000 parsecs. e. none of the above.arrow_forward
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