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Cosmology

Chapter 17 Clickers. Cosmology. Question 1. Because distant galaxies in every direction are moving away from us,. a) the Milky Way must be located at the edge of the universe. b) the Milky Way is at the center of the universe. c) the universe is expanding. d) the sky is dark at night.

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Cosmology

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  1. Chapter 17 Clickers Cosmology

  2. Question 1 Because distant galaxies in every direction are moving away from us, a) the Milky Way must be located at the edge of the universe. b) the Milky Way is at the center of the universe. c) the universe is expanding. d) the sky is dark at night. e) the universe has not changed significantly.

  3. Question 1 Because distant galaxies in every direction are moving away from us, a) the Milky Way must be located at the edge of the universe. b) the Milky Way is at the center of the universe. c) the universe is expanding. d) the sky is dark at night. e) the universe has not changed significantly.

  4. Question 2 Hubble’s constant, H0, can be related to a) the size of the universe. b) the age of the universe. c) the shape of the universe. d) the temperature of the universe. e) the distance the universe has expanded.

  5. Question 2 Hubble’s constant, H0, can be related to a) the size of the universe. b) the age of the universe. c) the shape of the universe. d) the temperature of the universe. e) the distance the universe has expanded. Explanation: H0 is currently estimated to be about 70 km/sec/Mpc. This translates to an age for the universe of about 14 billion years.

  6. Question 3 The redshift of galaxies is explained best as a) a Doppler shift of the random motions of galaxies. b) an aging of light as the universe ages. c) space itself expanding with time, stretching light. d) the result of the Milky Way’s position at the center. e) due to the temperature differences in the early and late universe.

  7. Question 3 The redshift of galaxies is explained best as a) a Doppler shift of the random motions of galaxies. b) an aging of light as the universe ages. c) space itself expanding with time, stretching light. d) the result of the Milky Way’s position at the center. e) due to the temperature differences in the early and late universe. Explanation: As the universe expands, photons of radiation are stretched in wavelength as they move through space.

  8. Question 4 Hubble’s law implies that the universe a) is infinitely old and getting larger. b) began expanding long ago, and has a finite age. c) will slow down because of dark matter. d) has repeatedly expanded and contracted. e) will eventually stop and recollapse.

  9. Question 4 Hubble’s law implies that the universe a) is infinitely old and getting larger. b) began expanding long ago, and has a finite age. c) will slow down because of dark matter. d) has repeatedly expanded and contracted. e) will eventually stop and recollapse. Explanation: Using the Hubble constant H0, astronomers can estimate that the universe was born about 14 billion years ago.

  10. Question 5 The cosmic microwave background radiation is a) evidence supporting the Big Bang. b) proof that the universe is getting warmer. c) a result of the hot intergalactic gas between clusters. d) the observable form of dark energy. e) released from the first generation of stars in the universe.

  11. Question 5 The cosmic microwave background radiation is a) evidence supporting the Big Bang. b) proof that the universe is getting warmer. c) a result of the hot intergalactic gas between clusters. d) the observable form of dark energy. e) released from the first generation of stars in the universe. Explanation: The radiation observed is the “fossil remnant” of the primeval fireball that existed at the very beginning of the universe.

  12. Question 7 In a closed universe a) the universe will eventually stop expanding and recollapse. b) dark matter will dominate over dark energy. c) the universe will stop expanding and remain stationary. d) dark energy will dominate over dark matter. e) the universe will not stop expanding.

  13. Question 7 In a closed universe a) the universe will eventually stop expanding and recollapse. b) dark matter will dominate over dark energy. c) the universe will stop expanding and remain stationary. d) dark energy will dominate over dark matter. e) the universe will not stop expanding. Explanation: Greater density means more matter in a smaller volume, and gravity will be strong enough to stop the expansion and cause a “Big Crunch.”

  14. Question 8 If the density of the universe is greater than “critical”, a) there is more matter than energy. b) the universe is closed, and will recollapse. c) the universe is open, and will keep expanding. d) dark matter will dominate, and galaxies will stop expanding. e) there was more helium than hydrogen created in the Big Bang.

  15. Question 8 If the density of the universe is greater than “critical”, a) there is more matter than energy. b) the universe is closed, and will recollapse. c) the universe is open, and will keep expanding. d) dark matter will dominate, and galaxies will stop expanding. e) there was more helium than hydrogen created in the Big Bang.

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