Galaxies – Review
Questions!
16-1.The stars in which type of galaxy can
be uniformly distributed in a sphere?
a)
b)
c)
d)
elliptical
normal spiral
barred spiral
irregular
16-1.The stars in which type of galaxy can
be uniformly distributed in a sphere?
a)
b)
c)
d)
elliptical *
normal spiral
barred spiral
irregular
16-2. Which type of galaxy is presently the
most commonly observed type?
a)
b)
c)
d)
normal spiral
barred spiral
elliptical
irregular
16-2. Which type of galaxy is presently the
most commonly observed type?
a)
b)
c)
d)
normal spiral
barred spiral
elliptical *
irregular
16-3. The smallest known galaxies are of
which kind?
a)
b)
c)
d)
elliptical
barred spiral
normal spiral
irregular
16-3. The smallest known galaxies are of
which kind?
a)
b)
c)
d)
elliptical
*
barred spiral
normal spiral
irregular
16-12. Which type of galaxy has very
little gas or dust?
a)
b)
c)
d)
Elliptical
Spiral
Irregular
All of the above
16-12. Which type of galaxy has very
little gas or dust?
a)
b)
c)
d)
Elliptical
Spiral
Irregular
All of the above
16-4. The largest known galaxies are of
which kind?
a)
b)
c)
d)
elliptical
normal Spiral
barred Spiral
irregular
16-4. The largest known galaxies are of
which kind?
a)
b)
c)
d)
elliptical *
normal Spiral
barred Spiral
irregular
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.
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. *
16-6. What is located between a disk
galaxy’s spiral arms?
a)
b)
c)
d)
nothing
only interstellar gas and dust
almost as many stars as in the arms
more stars than are in the arms
16-6. What is located between a disk
galaxy’s spiral arms?
a)
b)
c)
d)
nothing
only interstellar gas and dust
almost as many stars as in the arms
more stars than are in the arms
16-7.
Which observation correctly
applies to galaxies in other superclusters?
a)
b)
c)
d)
they are all moving towards us
they are all moving away from us
they are all larger than the Milky Way
they are all smaller than the Milky Way
16-7.
Which observation correctly
applies to galaxies in other superclusters?
a)
b)
c)
d)
they are all moving towards us
they are all moving away from us *
they are all larger than the Milky Way
they are all smaller than the Milky Way
16-8. Spiral density waves describe which of the
following?
a)
b)
c)
d)
the ripples seen in comet tails
the pulses of a pulsar
the belts and zones in Jupiter’s upper
layers
ripples in the gas of our Galaxy
16-8. Spiral density waves describe which of the
following?
a)
b)
c)
d)
the ripples seen in comet tails
the pulses of a pulsar
the belts and zones in Jupiter’s upper
layers
ripples in the gas of our Galaxy *
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.
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.
16-10. Edwin Hubble first showed that Andromeda
was a distant galaxy by
a)
b)
c)
d)
measuring the distance to it using
Cepheid variables.
measuring the distance to it using RR
Lyrae variables.
precisely measuring its parallax angle.
observing nova in the galaxy.
16-10. Edwin Hubble first showed that Andromeda
was a distant galaxy by
a)
b)
c)
d)
measuring the distance to it using
Cepheid variables.
*
measuring the distance to it using RR
Lyrae variables.
precisely measuring its parallax angle.
observing nova in the galaxy.
Chapter 16 Thought/Writing
Questions
1. List three methods of determining
distances in the universe.
2. Why do spiral galaxies have spiral arms?
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)
b)
c)
d)
they have the highest blue shifts of any
objects in the universe
they have the smallest blue shifts of any
objects in the universe
they have the highest red shifts of any
objects in the universe
they have the smallest red shifts of any
objects in the universe
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)
b)
c)
d)
they have the highest blue shifts of any
objects in the universe
they have the smallest blue shifts of any
objects in the universe
they have the highest red shifts of any
objects in the universe *
they have the smallest red shifts of any
objects in the universe
17-6. The time for a fluctuation in brightness
of a quasar allows astronomers to place an
upper limit on its
a)
b)
c)
d)
luminosity.
size.
age.
distance.
17-6. The time for a fluctuation in brightness
of a quasar allows astronomers to place an
upper limit on its
a)
b)
c)
d)
luminosity.
size.
age.
distance.