21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 22, Problem 14QP
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Galaxy seeds around which galaxies, clusters, and walls grew may have been
a.
caused by hot dark matter.
b.
caused by baryons.
c.
the result of the separation of the electromagnetic and weak forces.
d.
the result of freezing water molecules shortly after the universe became transparent to photons.
e.
caused by microscopic random fluctuations in the infant universe.
In 1998, it was announced that the expansion of the universe is accelerating. What does this imply from the perspective of the big bang?
a.
A force exists that we knew nothing about causes the expansion.
b.
The universe must be closed.
c.
The universe is finite.
d.
The amount of dark matter must be far less than the amount of normal matter.
e.
The universe must be infinitely old.
If the universe is closed and finite, then
a.
the universe has a center and an edge.
b.
the universe will expand forever.
c.
the final fate of the universe will be very cold and of extremely low density.
d.
the space-time of the universe is negatively curved.
e.
none of the above are true.
Chapter 22 Solutions
21st Century Astronomy
Ch. 22.1 - Prob. 22.1CYUCh. 22.2 - Prob. 22.2CYUCh. 22.3 - Prob. 22.3CYUCh. 22.4 - Prob. 22.4CYUCh. 22.5 - Prob. 22.5CYUCh. 22 - Prob. 1QPCh. 22 - Prob. 2QPCh. 22 - Prob. 3QPCh. 22 - Prob. 4QPCh. 22 - Prob. 5QP
Ch. 22 - Prob. 6QPCh. 22 - Prob. 7QPCh. 22 - Prob. 8QPCh. 22 - Prob. 9QPCh. 22 - Prob. 10QPCh. 22 - Prob. 11QPCh. 22 - Prob. 12QPCh. 22 - Prob. 13QPCh. 22 - Prob. 14QPCh. 22 - Prob. 15QPCh. 22 - Prob. 16QPCh. 22 - Prob. 17QPCh. 22 - Prob. 18QPCh. 22 - Prob. 19QPCh. 22 - Prob. 20QPCh. 22 - Prob. 21QPCh. 22 - Prob. 22QPCh. 22 - Prob. 24QPCh. 22 - Prob. 28QPCh. 22 - Prob. 29QPCh. 22 - Prob. 31QPCh. 22 - Prob. 32QPCh. 22 - Prob. 33QPCh. 22 - Prob. 34QPCh. 22 - Prob. 35QPCh. 22 - Prob. 36QPCh. 22 - Prob. 37QPCh. 22 - Prob. 38QPCh. 22 - Prob. 39QPCh. 22 - Prob. 40QPCh. 22 - Prob. 41QPCh. 22 - Prob. 42QPCh. 22 - Prob. 43QPCh. 22 - Prob. 44QPCh. 22 - Prob. 45QP
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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
- We know that dark matter must exist in galaxies. If not, many of the stars in a galaxy would ... a.Expand and go supernova due to the expansion of the Universe b.Fly away from the galaxy because the stars’ velocities are so large, and the galaxy would not have enough gravity to hold onto them c.Orbit the center of the galaxy normally d.Spiral in toward the center of the galaxy because most of the galaxy’s mass would be toward the centerarrow_forwardThe main reason the night sky is dark is that the universe is a. homogeneous. b. static. c. infinite in size. d. expanding. e. finite in age.arrow_forwardWhat 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_forward
- 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_forwardWhere does gold (the element) come from? A. It is produced during the supernova explosions of high-mass stars. B. It was produced during the Big Bang. C. It is produced by mass transfer in close binaries. D. It is produced during the late stages of fusion in low-mass stars.arrow_forwardThe density of the universe is a. equal to the critical density if the universe is closed. b. equal to the critical density if the universe is flat. c. greater than the critical density if the universe is flat. d. greater than the critical density if the universe is open. e. none of the above.arrow_forward
- Current evidence suggests that the universe is a. flat, infinite, and neither expanding nor contracting. b. closed, finite, and slowing its expansion. c. open, infinite, and slowing its expansion. d. open, finite, and accelerating its expansion. e. flat, infinite, and accelerating its expansion.arrow_forwardThe peculiar system SS 433 I. is emitting beams of energy and matter. II. is producing a spectrum with both a redshift and a blueshift. III. probably contains an accretion disk. IV. is the result of a planetary nebula. a. I b. III c. II & III d. I, II, & III e. I, II, III, & IVarrow_forwardOf the following objects, the one that produces the least energy is a a. supernova. b. Type 1 Seyfert galaxy. c. Type 2 Seyfert galaxy. d. quasar.arrow_forward
- The 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_forwardWhat strong evidence found in the mid-1960s led to wide acceptance of the big bang theory of the universe? a. the discovery of antimatter b. the discovery of neutrinos c. the discovery of Cepheids as standard candles d. the discovery of the cosmic background radiation e. the discovery of the 21 cm radiation for neutral hydrogenarrow_forwardWhat was the temperature of the universe when the recombination took place that produced the cosmic background radiation we observe today? a. about 2.7 K b. about 300 K c. about 3000 K d. about 3 million K e. about 3 billion Karrow_forward
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