21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 1, Problem 7QP
To determine
State Occam’s razor principle.
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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.
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.
The 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.
Chapter 1 Solutions
21st Century Astronomy
Ch. 1.1 - Prob. 1.1CYUCh. 1.2 - Prob. 1.2CYUCh. 1.3 - Prob. 1.3CYUCh. 1 - Prob. 1QPCh. 1 - Prob. 2QPCh. 1 - Prob. 3QPCh. 1 - Prob. 4QPCh. 1 - Prob. 5QPCh. 1 - Prob. 6QPCh. 1 - Prob. 7QP
Ch. 1 - Prob. 8QPCh. 1 - Prob. 9QPCh. 1 - Prob. 10QPCh. 1 - Prob. 11QPCh. 1 - Prob. 12QPCh. 1 - Prob. 13QPCh. 1 - Prob. 14QPCh. 1 - Prob. 15QPCh. 1 - Prob. 16QPCh. 1 - Prob. 17QPCh. 1 - Prob. 18QPCh. 1 - Prob. 19QPCh. 1 - Prob. 20QPCh. 1 - Prob. 21QPCh. 1 - Prob. 22QPCh. 1 - Prob. 23QPCh. 1 - Prob. 24QPCh. 1 - Prob. 25QPCh. 1 - Prob. 26QPCh. 1 - Prob. 27QPCh. 1 - Prob. 28QPCh. 1 - Prob. 29QPCh. 1 - Prob. 30QPCh. 1 - Prob. 31QPCh. 1 - Prob. 32QPCh. 1 - Prob. 33QPCh. 1 - Prob. 34QPCh. 1 - Prob. 35QPCh. 1 - Prob. 36QPCh. 1 - Prob. 37QPCh. 1 - Prob. 38QPCh. 1 - Prob. 39QPCh. 1 - Prob. 40QPCh. 1 - Prob. 41QPCh. 1 - Prob. 42QPCh. 1 - Prob. 43QPCh. 1 - Prob. 44QPCh. 1 - Prob. 45QP
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- The 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_forward4. Which of the following constituents of the Universe is present in the highest fraction in terms of its contribution to the total energy of the Universe? a. Dark Matter. b. Dark Energy. c. Light. d. Normal (baryonic) matter.arrow_forward21. Which of the following represents the notion that our observable Universe may be a part of a much larger whole? a. Big Bang Nucleosynthesis. b. Solar System. c. Galaxy. d. Multiverse.arrow_forward
- How does the age of the universe relate to the Hubble constant? a. The smaller the constant, the older the universe. b. The larger the constant, the older the universe. c. The Hubble constant is the age of the universe. d. The Hubble constant is the square of the universe. e. It is impossible to tell the age of the universe from the Hubble constant.arrow_forwardThe cosmic background radiation comes from a time in the evolution of the universe a. when protons and neutrons were first formed. b. when the big bang first began to expand. c. that is known as the inflationary period. d. when gamma rays had enough energy to destroy nuclei. e. when electrons began to recombine with nuclei to form atoms.arrow_forward1. Which of these is true about the Big Bang model? a. The singularity is an established, well-defined part of the model. b. Cosmic expansion stopped at some point in time. c. Part of its proof is the amounts of H and He we have in the universe today. d. The Big Bang was a big explosion that threw matter into many different directionsarrow_forward
- Which of the following is most likely to yield evidence to support one of the models of the future of the universe? 1. Analysis of different types of radiation coming from the center of the Earth. 2. Analysis of asteroids in the solar system data collected from planetary missions. 3. Data collected from observing galaxies and clusters of galaxies of different ages. 4. Data collected from observing the arms of the Milky Way galaxy.arrow_forward18. What is the name of the period in the Early Universe during which the Universe expanded very rapidly as a quantum system? a. Inflation. b. Cosmic Microwave Background. c. Gravitational Collapse. d. Big Bang Nucleosynthesis.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
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