Question 1

____ 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 2

Galactic cannibalism refers to

Accepted Answer

A)  binary galaxies. 
B)  the merging of galaxies. 
C)  galaxies drawing in gas from the intergalactic medium. 
D)  the destruction of a galaxy's globular clusters by the galaxy's nucleus. 
E)  none of these. 
A)  binary galaxies. 
B)  the merging of galaxies. 
C)  galaxies drawing in gas from the intergalactic medium. 
D)  the destruction of a galaxy's globular clusters by the galaxy's nucleus. 
E)  none of these.

Question 3

How does the use of H II regions to find a galaxy's distance differ from the use of Cepheid variables?

Accepted Answer

The use of H II regions and Cepheid vari

Question 4

The Milky Way galaxy is part of

Accepted Answer

A)  the Virgo cluster. 
B)  the Large Magellanic Cloud. 
C)  the Small Magellanic Cloud. 
D)  the Local Group. 
E)  a rich cluster. 
A)  the Virgo cluster. 
B)  the Large Magellanic Cloud. 
C)  the Small Magellanic Cloud. 
D)  the Local Group. 
E)  a rich cluster.

Question 5

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)  both answers A and B 
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)  both answers A and B 
D)  It is impossible to estimate the size of M31.

Question 6

Some quasars have fuzz around them that produce spectra similar to normal galaxies.

Accepted Answer

A) True 
 B)False

Question 7

If a galaxy has a radial velocity of 8000 km/s and the Hubble constant is 70 km/s/Mpc, what is the distance to this galaxy?

Accepted Answer

A)  8.75*03 Mpc 
B)  2.4*109 Mpc 
C)  5.6*105 Mpc 
D)  114 Mpc 
E)  8.75*10-3 Mpc 
A)  8.75*03 Mpc 
B)  2.4*109 Mpc 
C)  5.6*105 Mpc 
D)  114 Mpc 
E)  8.75*10-3 Mpc

Question 8

The hydrogen Balmer line H $\beta$ has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the fractional change in wavelength or redshift z of this quasar?

Accepted Answer

A)  5 
B)  0.5 
C)  0.25 
D)  4 
E)  1944.4 
A)  5 
B)  0.5 
C)  0.25 
D)  4 
E)  1944.4

Question 9

It is believed that ring galaxies form

Accepted Answer

A)  when two galaxies collide nearly head on at high speed. 
B)  when two spiral galaxies collide, but not directly head on. 
C)  from a large cloud of gas and dust with very little angular momentum. 
D)  from a large cloud of gas and dust with a very high angular momentum. 
E)  when more than two galaxies collide at the same time. 
A)  when two galaxies collide nearly head on at high speed. 
B)  when two spiral galaxies collide, but not directly head on. 
C)  from a large cloud of gas and dust with very little angular momentum. 
D)  from a large cloud of gas and dust with a very high angular momentum. 
E)  when more than two galaxies collide at the same time.

Question 10

Evidence that supports quasars being the nuclei of very distant galaxies includes

Accepted Answer

A)  the existence of quasar fuzz. 
B)  the observation of a supernova near a quasar whose distance from its brightness is consistent with the large redshift. 
C)  gravitational lensing of some quasars by nearby galaxies. 
D)  all of the above. 
E)  none of the above. 
A)  the existence of quasar fuzz. 
B)  the observation of a supernova near a quasar whose distance from its brightness is consistent with the large redshift. 
C)  gravitational lensing of some quasars by nearby galaxies. 
D)  all of the above. 
E)  none of the above.

Question 11

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 12

The Local Group of galaxies is dominated by the presence of spiral galaxies.

Accepted Answer

A) True 
 B)False

Question 13

____________________ clusters of galaxies contain closely spaced galaxies and often contain giant elliptical galaxies and a hot intergalactic medium.

Accepted Answer

The answer of ____________________ clusters of galaxies contain closely spaced...

Question 14

Describe a model of a quasar and show how the model explains the observed properties of a quasar.

Accepted Answer

A quasar is a compact region in the cent

Question 15

Double-lobed radio galaxies appear to be emitting jets of gas and radiation.

Accepted Answer

A) True 
 B)False

Question 16

___ can be used to determine the galaxy's mass if the galaxy is reasonably close, so that the Doppler shift of the galaxy disk material can be measured at several distances from the galaxy's center relative to the center.

Accepted Answer

A)  The Hubble constant 
B)  A galaxy's color 
C)  A galaxy's rotation curve 
D)  A galaxy's diameter 
E)  The velocity dispersion method 
A)  The Hubble constant 
B)  A galaxy's color 
C)  A galaxy's rotation curve 
D)  A galaxy's diameter 
E)  The velocity dispersion method

Question 17

The letters AGN stand for

Accepted Answer

A)  three spectral types of stars. 
B)  active planet. 
C)  active star. 
D)  active galaxy nucleus. 
E)  none of the above. 
A)  three spectral types of stars. 
B)  active planet. 
C)  active star. 
D)  active galaxy nucleus. 
E)  none of the above.

Question 18

Active galaxies are thought to have _______ in their centers.

Accepted Answer

A)  accretion disks 
B)  massive black holes 
C)  both a and b 
D)  the Local Group 
E)  a cluster of galaxies 
A)  accretion disks 
B)  massive black holes 
C)  both a and b 
D)  the Local Group 
E)  a cluster of galaxies

Question 19

If the absolute magnitude, M, of a supernova is -19 and a galaxy is found that contains a supernova with an apparent magnitude, m, of 16. What is the distance to the galaxy? Hint: dpc = 10(m - M + 5)/5

Accepted Answer

A)  100 AU 
B)  100 pc 
C)  100 ly 
D)  100 kpc 
E)  100 Mpc 
A)  100 AU 
B)  100 pc 
C)  100 ly 
D)  100 kpc 
E)  100 Mpc

Question 20

The rotation curve method can be applied only to pairs of galaxies orbiting each other.

Accepted Answer

A) True 
 B)False

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

Galactic cannibalism refers to

How does the use of H II regions to find a galaxy's distance differ from the use of Cepheid variables?

The Milky Way galaxy is part of

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

Some quasars have fuzz around them that produce spectra similar to normal galaxies.

If a galaxy has a radial velocity of 8000 km/s and the Hubble constant is 70 km/s/Mpc, what is the distance to this galaxy?

The hydrogen Balmer line H _$\beta$ has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the fractional change in wavelength or redshift z of this quasar?

It is believed that ring galaxies form

Evidence that supports quasars being the nuclei of very distant galaxies includes

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 Local Group of galaxies is dominated by the presence of spiral galaxies.

____________________ clusters of galaxies contain closely spaced galaxies and often contain giant elliptical galaxies and a hot intergalactic medium.

Describe a model of a quasar and show how the model explains the observed properties of a quasar.

Double-lobed radio galaxies appear to be emitting jets of gas and radiation.

___ can be used to determine the galaxy's mass if the galaxy is reasonably close, so that the Doppler shift of the galaxy disk material can be measured at several distances from the galaxy's center relative to the center.

The letters AGN stand for

Active galaxies are thought to have _______ in their centers.

If the absolute magnitude, M, of a supernova is -19 and a galaxy is found that contains a supernova with an apparent magnitude, m, of 16. What is the distance to the galaxy? Hint: d_pc = 10⁽^m^-^M^{+ 5)/5}

The rotation curve method can be applied only to pairs of galaxies orbiting each other.

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

The Origin of the Solar System

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

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

Galactic cannibalism refers to

How does the use of H II regions to find a galaxy's distance differ from the use of Cepheid variables?

The Milky Way galaxy is part of

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

Some quasars have fuzz around them that produce spectra similar to normal galaxies.

If a galaxy has a radial velocity of 8000 km/s and the Hubble constant is 70 km/s/Mpc, what is the distance to this galaxy?

The hydrogen Balmer line H β\betaβ has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the fractional change in wavelength or redshift z of this quasar?

It is believed that ring galaxies form

Evidence that supports quasars being the nuclei of very distant galaxies includes

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 Local Group of galaxies is dominated by the presence of spiral galaxies.

____________________ clusters of galaxies contain closely spaced galaxies and often contain giant elliptical galaxies and a hot intergalactic medium.

Describe a model of a quasar and show how the model explains the observed properties of a quasar.

Double-lobed radio galaxies appear to be emitting jets of gas and radiation.

___ can be used to determine the galaxy's mass if the galaxy is reasonably close, so that the Doppler shift of the galaxy disk material can be measured at several distances from the galaxy's center relative to the center.

The letters AGN stand for

Active galaxies are thought to have _______ in their centers.

If the absolute magnitude, M, of a supernova is -19 and a galaxy is found that contains a supernova with an apparent magnitude, m, of 16. What is the distance to the galaxy? Hint: dpc = 10(m - M + 5)/5

The rotation curve method can be applied only to pairs of galaxies orbiting each other.

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

The Origin of the Solar System

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

The hydrogen Balmer line H _$\beta$ has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the fractional change in wavelength or redshift z of this quasar?

If the absolute magnitude, M, of a supernova is -19 and a galaxy is found that contains a supernova with an apparent magnitude, m, of 16. What is the distance to the galaxy? Hint: d_pc = 10⁽^m^-^M^{+ 5)/5}