Concept explainers
The correct statement
Answer to Problem 1QP
Option (d)
Explanation of Solution
According to
The critical density is proportional to the square of the Hubble constant, which is used in measuring the expansion rate of the universe.
Comparing the critical density to the actual density can help scientists to understand the cosmos.
Conclusion:
The density of the universe dictates whether it will be open, closed, or flat. Therefore, option (d) is correct.
The density of the universe dictates whether it will be open, closed, or flat. Therefore, option (a) is incorrect.
The density of the universe dictates whether it will be open, closed, or flat. Therefore, option (b) is incorrect.
The density of the universe dictates whether it will be open, closed, or flat. Therefore, option (c) is incorrect.
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Chapter 22 Solutions
21st Century Astronomy
- 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.arrow_forwardGalaxy 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.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
- In a Universe with Ω=1, without the presence of dark energy, the expansion of the Universe would a. remain constant over time b. slow down over time c. reverse and then collapse d. speed up over timearrow_forwardThe assumption of isotropy states that a. the universe looks the same at all epochs. b. the universe looks the same from all locations over sufficiently great distances. c. the universe looks the same in all directions over sufficiently great distances. d. all of the above are true. e. none of the above are true.arrow_forwardWhat is the approximate temperature of the universe that we currently observe? a. 0 K b. 2.7 K c. 273 K d. 3000 K e. 6000 Karrow_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 resolution of Olbers’s paradox suggests that it gets dark at night because a. the universe is not infinite in age. b. the universe is static. c. the universe is closed. d. a and b are true. e. all of the above are true.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_forward
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