Question 1

What kind of galaxy is this?

Accepted Answer

A)  elliptical 
B)  spiral 
C)  Seyfert 
D)  lenticular (e.g., S0) 
A)  elliptical 
B)  spiral 
C)  Seyfert 
D)  lenticular (e.g., S0) A

Question 2

The radio radiation emitted by a radio lobe is mainly synchrotron radiation.

Accepted Answer

A) True 
 B)False  True

Question 3

The total mass of galaxies in a cluster of galaxies divided by the number of galaxies in the cluster can be used to determine a typical galaxy's ___________.

Accepted Answer

A)  luminosity 
B)  distance 
C)  mass 
D)  diameter 
E)  age 
A)  luminosity 
B)  distance 
C)  mass 
D)  diameter 
E)  age C

Question 4

The above visual wavelength image shows galaxies interacting.

Accepted Answer

A) True 
 B)False

Question 5

In the above visual wavelength image, the two galaxies shown are most likely to have formed from ____________.

Accepted Answer

A)  two colliding elliptical galaxies 
B)  two interacting disk galaxies 
C)  two colliding S0 galaxies 
D)  two interacting irregular galaxies 
A)  two colliding elliptical galaxies 
B)  two interacting disk galaxies 
C)  two colliding S0 galaxies 
D)  two interacting irregular galaxies

Question 6

One way we know this is an elliptical galaxy as opposed to a spiral galaxy is that the color is red as shown.

Accepted Answer

A) True 
 B)False

Question 7

Most of the mass of a galaxy is contained in the

Accepted Answer

A)  massive O and B stars in the galaxy. 
B)  H I regions of the galaxy. 
C)  H II regions of the galaxy. 
D)  dark matter of the galaxy. 
E)  disk of the galaxy. 
A)  massive O and B stars in the galaxy. 
B)  H I regions of the galaxy. 
C)  H II regions of the galaxy. 
D)  dark matter of the galaxy. 
E)  disk of the galaxy.

Question 8

What was the first evidence that quasars were different from astronomical objects before they were observed in visual wavelengths?

Accepted Answer

A)  The first quasars were seen to have fuzz. 
B)  Quasars emitted radio energy like active galaxies, but appeared to be point sources in radio wavelengths. 
C)  Quasars showed significant gravitational lens effects. 
D)  The spectra of quasars looked like that of an M dwarf. 
E)  The larger redshifts originally indicated that they were orbiting the center of the Milky Way. 
A)  The first quasars were seen to have fuzz. 
B)  Quasars emitted radio energy like active galaxies, but appeared to be point sources in radio wavelengths. 
C)  Quasars showed significant gravitational lens effects. 
D)  The spectra of quasars looked like that of an M dwarf. 
E)  The larger redshifts originally indicated that they were orbiting the center of the Milky Way.

Question 9

The diagram illustrates physical size and angular size as seen by the observer. We can estimate the size in light years (or parsecs or km) of M31 from

Accepted Answer

A)  its angular size in degrees. 
B)  its distance in light years (or parsecs or km). 
C)  its angular size in degrees and its distance in light years (or parsecs or km). 
D)  It is impossible to estimate the size of M31. 
A)  its angular size in degrees. 
B)  its distance in light years (or parsecs or km). 
C)  its angular size in degrees and its distance in light years (or parsecs or km). 
D)  It is impossible to estimate the size of M31.

Question 10

Evidence that tidal interactions and collisions of galaxies may make ordinary galaxies active is that

Accepted Answer

A)  many active galaxies are distorted. 
B)  some active galaxies have companions. 
C)  many active galaxies are distorted and some active galaxies have companions. 
D)  active galaxies are neither distorted nor have companions. 
A)  many active galaxies are distorted. 
B)  some active galaxies have companions. 
C)  many active galaxies are distorted and some active galaxies have companions. 
D)  active galaxies are neither distorted nor have companions.

Question 11

Seyfert galaxies are spiral galaxies with active cores.

Accepted Answer

A) True 
 B)False

Question 12

Astronomers who discovered quasars found that they show ___________ of their spectral lines and are thus probably much ___________ than nearby galaxies.

Accepted Answer

A)  large redshifts; farther away 
B)  large blueshifts; farther away 
C)  no wavelength difference; nearer 
D)  large redshifts; nearer 
E)  large blueshift; nearer 
A)  large redshifts; farther away 
B)  large blueshifts; farther away 
C)  no wavelength difference; nearer 
D)  large redshifts; nearer 
E)  large blueshift; nearer

Question 13

If a quasar has a recessional velocity of 2.7 × 105 km/s and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone? Hint: Note that the units of your result should be (km/s)/Mpc to see what arithmetic process you need to perform.

Accepted Answer

A)  50 km/s/Mpc 
B)  9.7 × 108 (km/s)Mpc 
C)  75 km/s/Mpc 
D)  0.013 km/s/Mpc 
E)  273,600 km/s/Mpc 
A)  50 km/s/Mpc 
B)  9.7 × 108 (km/s)Mpc 
C)  75 km/s/Mpc 
D)  0.013 km/s/Mpc 
E)  273,600 km/s/Mpc

Question 14

The Hubble law is a relation between a galaxy's

Accepted Answer

A)  mass and its luminosity. 
B)  distance and its luminosity. 
C)  mass and its recession velocity. 
D)  distance and its recession velocity. 
E)  mass and its diameter. 
A)  mass and its luminosity. 
B)  distance and its luminosity. 
C)  mass and its recession velocity. 
D)  distance and its recession velocity. 
E)  mass and its diameter.

Question 15

___________ have elongated nuclei with spiral structure extending from the ends of the elongations. The Milky Way is a member of this class of galaxy.

Accepted Answer

A)  Spiral galaxies 
B)  Barred spiral galaxies 
C)  Elliptical galaxies 
D)  Irregular galaxies 
E)  S0 galaxies 
A)  Spiral galaxies 
B)  Barred spiral galaxies 
C)  Elliptical galaxies 
D)  Irregular galaxies 
E)  S0 galaxies

Question 16

If the redshifts of quasars arise from the expansion of the universe yet they have brighter magnitudes than galaxies with the same redshifts, the quasar must

Accepted Answer

A)  be very small. 
B)  be within the Local Group. 
C)  be a single star with an extremely large mass. 
D)  be moving toward Earth with a large radial velocity. 
E)  emit a very large amount of energy per second. 
A)  be very small. 
B)  be within the Local Group. 
C)  be a single star with an extremely large mass. 
D)  be moving toward Earth with a large radial velocity. 
E)  emit a very large amount of energy per second.

Question 17

The above visual wavelength image is an ___________-type galaxy.

Accepted Answer

A)  Sa 
B)  S0 
C)  Sc 
D)  SBa 
A)  Sa 
B)  S0 
C)  Sc 
D)  SBa

Question 18

Which distance indicator technique is best to find distances to galaxies?

Accepted Answer

A)  Cepheid variables 
B)  radar 
C)  small-angle formula 
D)  magnitude-distance formula 
A)  Cepheid variables 
B)  radar 
C)  small-angle formula 
D)  magnitude-distance formula

Question 19

Mathematical models indicate that ___________ galaxies are produced by high-speed collisions in which a smaller galaxy passes through another galaxy almost perpendicular to the disk of the galaxy.

Accepted Answer

A)  ring 
B)  spiral 
C)  antenna 
D)  irregular 
E)  tidal tail 
A)  ring 
B)  spiral 
C)  antenna 
D)  irregular 
E)  tidal tail

Question 20

The rapid fluctuations of quasars show that the energy emitting portions of these objects must be very small.

Accepted Answer

A) True 
 B)False

What kind of galaxy is this?

The radio radiation emitted by a radio lobe is mainly synchrotron radiation.

The total mass of galaxies in a cluster of galaxies divided by the number of galaxies in the cluster can be used to determine a typical galaxy's ___________.

The above visual wavelength image shows galaxies interacting.

In the above visual wavelength image, the two galaxies shown are most likely to have formed from ____________.

One way we know this is an elliptical galaxy as opposed to a spiral galaxy is that the color is red as shown.

Most of the mass of a galaxy is contained in the

What was the first evidence that quasars were different from astronomical objects before they were observed in visual wavelengths?

The diagram illustrates physical size and angular size as seen by the observer. We can estimate the size in light years (or parsecs or km) of M31 from

Evidence that tidal interactions and collisions of galaxies may make ordinary galaxies active is that

Seyfert galaxies are spiral galaxies with active cores.

Astronomers who discovered quasars found that they show _ of their spectral lines and are thus probably much _ than nearby galaxies.

If a quasar has a recessional velocity of 2.7 × 10⁵ km/s and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone? Hint: Note that the units of your result should be (km/s)/Mpc to see what arithmetic process you need to perform.

The Hubble law is a relation between a galaxy's

___________ have elongated nuclei with spiral structure extending from the ends of the elongations. The Milky Way is a member of this class of galaxy.

If the redshifts of quasars arise from the expansion of the universe yet they have brighter magnitudes than galaxies with the same redshifts, the quasar must

The above visual wavelength image is an ___________-type galaxy.

Which distance indicator technique is best to find distances to galaxies?

Mathematical models indicate that ___________ galaxies are produced by high-speed collisions in which a smaller galaxy passes through another galaxy almost perpendicular to the disk of the galaxy.

The rapid fluctuations of quasars show that the energy emitting portions of these objects must be very small.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Exam 13: Galaxies: Normal and Active

What kind of galaxy is this?

The radio radiation emitted by a radio lobe is mainly synchrotron radiation.

The total mass of galaxies in a cluster of galaxies divided by the number of galaxies in the cluster can be used to determine a typical galaxy's ___________.

The above visual wavelength image shows galaxies interacting.

In the above visual wavelength image, the two galaxies shown are most likely to have formed from ____________.

One way we know this is an elliptical galaxy as opposed to a spiral galaxy is that the color is red as shown.

Most of the mass of a galaxy is contained in the

What was the first evidence that quasars were different from astronomical objects before they were observed in visual wavelengths?

The diagram illustrates physical size and angular size as seen by the observer. We can estimate the size in light years (or parsecs or km) of M31 from

Evidence that tidal interactions and collisions of galaxies may make ordinary galaxies active is that

Seyfert galaxies are spiral galaxies with active cores.

Astronomers who discovered quasars found that they show ___________ of their spectral lines and are thus probably much ___________ than nearby galaxies.

If a quasar has a recessional velocity of 2.7 × 105 km/s and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone? Hint: Note that the units of your result should be (km/s)/Mpc to see what arithmetic process you need to perform.

The Hubble law is a relation between a galaxy's

___________ have elongated nuclei with spiral structure extending from the ends of the elongations. The Milky Way is a member of this class of galaxy.

If the redshifts of quasars arise from the expansion of the universe yet they have brighter magnitudes than galaxies with the same redshifts, the quasar must

The above visual wavelength image is an ___________-type galaxy.

Which distance indicator technique is best to find distances to galaxies?

Mathematical models indicate that ___________ galaxies are produced by high-speed collisions in which a smaller galaxy passes through another galaxy almost perpendicular to the disk of the galaxy.

The rapid fluctuations of quasars show that the energy emitting portions of these objects must be very small.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Astronomers who discovered quasars found that they show _ of their spectral lines and are thus probably much _ than nearby galaxies.

If a quasar has a recessional velocity of 2.7 × 10⁵ km/s and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone? Hint: Note that the units of your result should be (km/s)/Mpc to see what arithmetic process you need to perform.