Galaxies

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Galaxies Review Questions!
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• 16-1.The stars in which type of galaxy can be
  uniformly distributed in a sphere?
• a) elliptical
• b) normal spiral
• c) barred spiral
• d) irregular

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• 16-1.The stars in which type of galaxy can be
  uniformly distributed in a sphere?
• a) elliptical
• b) normal spiral
• c) barred spiral
• d) irregular

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• 16-2. Which type of galaxy is presently the most
  commonly observed type?
• a) normal spiral
• b) barred spiral
• c) elliptical
• d) irregular

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• 16-2. Which type of galaxy is presently the most
  commonly observed type?
• a) normal spiral
• b) barred spiral
• c) elliptical
• d) irregular

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• 16-3. The smallest known galaxies are of which
  kind?
• a) elliptical
• b) barred spiral
• c) normal spiral
• d) irregular

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• 16-3. The smallest known galaxies are of which
  kind?
• a) elliptical
• b) barred spiral
• c) normal spiral
• d) irregular

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16-12. Which type of galaxy has very little gas
or dust?

• a) Elliptical
• b) Spiral
• c) Irregular
• d) All of the above

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16-12. Which type of galaxy has very little gas
or dust?

• a) Elliptical
• b) Spiral
• c) Irregular
• d) All of the above

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• 16-4. The largest known galaxies are of which
  kind?
• a) elliptical
• b) normal Spiral
• c) barred Spiral
• d) irregular

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• 16-4. The largest known galaxies are of which
  kind?
• a) elliptical
• b) normal Spiral
• c) barred Spiral
• d) irregular

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• 16-5. If a galaxy is moving away from us, its
  absorption lines will
• a) change towards higher or lower wavelengths
  depending on the speed of the galaxy.
• b) remain at the same wavelengths as lines from
  galaxies not moving away from us.
• c) all change towards shorter wavelengths.
• d) all change towards longer wavelengths.

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• 16-5. If a galaxy is moving away from us, its
  absorption lines will
• a) change towards higher or lower wavelengths
  depending on the speed of the galaxy.
• b) remain at the same wavelengths as lines from
  galaxies not moving away from us.
• c) all change towards shorter wavelengths.
• d) all change towards longer wavelengths.

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• 16-6. What is located between a disk galaxys
  spiral arms?
• a) nothing
• b) only interstellar gas and dust
• c) almost as many stars as in the arms
• d) more stars than are in the arms

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• 16-6. What is located between a disk galaxys
  spiral arms?
• a) nothing
• b) only interstellar gas and dust
• c) almost as many stars as in the arms
• d) more stars than are in the arms

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16-7. Which observation correctly applies to
galaxies in other superclusters?

• a) they are all moving towards us
• b) they are all moving away from us
• c) they are all larger than the Milky Way
• d) they are all smaller than the Milky Way

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16-7. Which observation correctly applies to
galaxies in other superclusters?

• a) they are all moving towards us
• b) they are all moving away from us
• c) they are all larger than the Milky Way
• d) they are all smaller than the Milky Way

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16-8. Spiral density waves describe which of the
following?

• a) the ripples seen in comet tails
• b) the pulses of a pulsar
• c) the belts and zones in Jupiters upper
  layers
• d) ripples in the gas of our Galaxy

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16-8. Spiral density waves describe which of the
following?

• a) the ripples seen in comet tails
• b) the pulses of a pulsar
• c) the belts and zones in Jupiters upper
  layers
• d) ripples in the gas of our Galaxy

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16-9. The Andromeda galaxy, in our local
cluster, is

• a) a spiral galaxy smaller than the Milky Way.
• b) a spiral galaxy larger than the Milky Way.
• c) an elliptical galaxy smaller than the Milky
  Way.
• d) an elliptical galaxy larger than the Milky
  Way.

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16-9. The Andromeda galaxy, in our local
cluster, is

• a) a spiral galaxy smaller than the Milky Way.
• b) a spiral galaxy larger than the Milky Way.
• c) an elliptical galaxy smaller than the Milky
  Way.
• d) an elliptical galaxy larger than the Milky
  Way.

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16-10. Edwin Hubble first showed that Andromeda
was a distant galaxy by

• a) measuring the distance to it using Cepheid
  variables.
• b) measuring the distance to it using RR Lyrae
  variables.
• c) precisely measuring its parallax angle.
• d) observing nova in the galaxy.

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16-10. Edwin Hubble first showed that Andromeda
was a distant galaxy by

• a) measuring the distance to it using Cepheid
  variables.
• b) measuring the distance to it using RR Lyrae
  variables.
• c) precisely measuring its parallax angle.
• d) observing nova in the galaxy.

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Chapter 16 Thought/Writing Questions

• 1. List three methods of determining distances
  in the universe.
• 2. Why do spiral galaxies have spiral arms?

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17-1. Some quasars are among the most distant
objects in the known universe. Which of the
following statements about them must be correct?

• a) they have the highest blue shifts of any
  objects in the universe
• b) they have the smallest blue shifts of any
  objects in the universe
• c) they have the highest red shifts of any
  objects in the universe
• d) they have the smallest red shifts of any
  objects in the universe

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17-1. Some quasars are among the most distant
objects in the known universe. Which of the
following statements about them must be correct?

• a) they have the highest blue shifts of any
  objects in the universe
• b) they have the smallest blue shifts of any
  objects in the universe
• c) they have the highest red shifts of any
  objects in the universe
• d) they have the smallest red shifts of any
  objects in the universe

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17-6. The time for a fluctuation in brightness
of a quasar allows astronomers to place an upper
limit on its

• a) luminosity.
• b) size.
• c) age.
• d) distance.

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17-6. The time for a fluctuation in brightness
of a quasar allows astronomers to place an upper
limit on its

• a) luminosity.
• b) size.
• c) age.
• d) distance.