Question 1

Quasars are most common with redshifts

Accepted Answer

A)  less than 0.1 
B)  less than 0.5 
C)  of about 2 
D)  greater than 6 
E)  greater than 8 
A)  less than 0.1 
B)  less than 0.5 
C)  of about 2 
D)  greater than 6 
E)  greater than 8

Question 2

Our galaxy is not a radio galaxy, but it does emit radio energy. Explain where this radio energy comes from.

Accepted Answer

The radio energy emitted by our galaxy c

Question 3

That the radio lobes radiate synchrotron radiation indicates that

Accepted Answer

A)  high-speed electrons are spiraling through a magnetic field. 
B)  the source of the radio jets must be a black hole. 
C)  the source of the radio energy is rotating rapidly. 
D)  the central galaxy must be a giant elliptical galaxy. 
E)  the central galaxy must rotate about two nearly perpendicular axes. 
A)  high-speed electrons are spiraling through a magnetic field. 
B)  the source of the radio jets must be a black hole. 
C)  the source of the radio energy is rotating rapidly. 
D)  the central galaxy must be a giant elliptical galaxy. 
E)  the central galaxy must rotate about two nearly perpendicular axes.

Question 4

If H equals 70 km/s/Mpc, then a galaxy with a radial velocity of 2100 km/s has a distance of approximately

Accepted Answer

A)  2170 Mpc. 
B)  2030 Mpc. 
C)  30 Mpc. 
D)  0.03 Mpc. 
E)  147,000 Mpc. 
A)  2170 Mpc. 
B)  2030 Mpc. 
C)  30 Mpc. 
D)  0.03 Mpc. 
E)  147,000 Mpc.

Question 5

Why can't evolution go from elliptical to spiral to irregular?

Accepted Answer

The question seems to be referring to th

Question 6

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 7

The Large and Small Magellanic Clouds are satellites galaxies of the Milky Way.

Accepted Answer

A) True 
 B)False

Question 8

A mega-parsec (Mpc) is equivalent to

Accepted Answer

A)  3.26 light-years. 
B)  206,265 light years. 
C)  1,000,000 light years 
D)  3,260,000 light-years. 
E)  the diameter of the Milky Way galaxy. 
A)  3.26 light-years. 
B)  206,265 light years. 
C)  1,000,000 light years 
D)  3,260,000 light-years. 
E)  the diameter of the Milky Way galaxy.

Question 9

We suspect that quasars are the active centers of galaxies because

Accepted Answer

A)  "fuzz" around the central luminous regions produces spectra like a collection of normal stars. 
B)  a few quasars have large redshifts. 
C)  the central regions of some quasars fluctuate rapidly. 
D)  all of the above. 
E)  none of the above. 
A)  "fuzz" around the central luminous regions produces spectra like a collection of normal stars. 
B)  a few quasars have large redshifts. 
C)  the central regions of some quasars fluctuate rapidly. 
D)  all of the above. 
E)  none of the above.

Question 10

When a large galaxy collides with a small galaxy, the smaller galaxy may be pulled apart by tidal forces.

Accepted Answer

A) True 
 B)False

Question 11

What observational evidence do we have that eruptions in the centers of galaxies involve magnetic fields?

Accepted Answer

The answer of What observational evidence do we have that...

Question 12

Describe the kind of observations that have led astronomers to believe that supermassive black holes lie at the center of many galaxies.

Accepted Answer

The answer of Describe the kind of observations that have...

Question 13

The look-back time is

Accepted Answer

A)  the time it takes for the light from an object to reach Earth. 
B)  numerically equal to the distance in light-years. 
C)  smaller for more distant objects. 
D)  all of the above. 
E)  a and b above. 
A)  the time it takes for the light from an object to reach Earth. 
B)  numerically equal to the distance in light-years. 
C)  smaller for more distant objects. 
D)  all of the above. 
E)  a and b above.

Question 14

Why should we expect quasars to be small? How small should we expect them to be?

Accepted Answer

The answer of Why should we expect quasars to be...

Question 15

____ is (are) observed when light from a distant quasar travels past a massive galaxy between us and the quasar, and this light is focused to form two or more images of the same quasar.

Accepted Answer

A)  A double-lobed radio galaxy 
B)  Superluminal expansion 
C)  The gravitational lens effect 
D)  A blazar 
E)  Gravitational waves 
A)  A double-lobed radio galaxy 
B)  Superluminal expansion 
C)  The gravitational lens effect 
D)  A blazar 
E)  Gravitational waves

Question 16

Jet-shaped regions of radio and optical emission have been observed in

Accepted Answer

A)  quasars. 
B)  radio galaxies. 
C)  the 3-Kelvin radiation. 
D)  both A and B 
A)  quasars. 
B)  radio galaxies. 
C)  the 3-Kelvin radiation. 
D)  both A and B

Question 17

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 18

Via the rotation curve method, we can estimate the mass of galaxies like M31 from

Accepted Answer

A)  Doppler shifts of material at the edge of its disk and computing P = 2 $\pi$r/v. 
B)  the distances of the Doppler shift points from its center. 
C)  both answers A and B 
D)  It is impossible to estimate the mass of M31. 
A)  Doppler shifts of material at the edge of its disk and computing P = 2 $\pi$r/v. 
B)  the distances of the Doppler shift points from its center. 
C)  both answers A and B 
D)  It is impossible to estimate the mass of M31.

Question 19

Starburst galaxies

Accepted Answer

A)  contain a large number of very young stars, but very little evidence of gas clouds. 
B)  contain a large number of very old stars and almost no gas or dust. 
C)  are often associated with a galaxy that is colliding with another galaxy. 
D)  are common in rich clusters. 
E)  are composed of filaments and voids. 
A)  contain a large number of very young stars, but very little evidence of gas clouds. 
B)  contain a large number of very old stars and almost no gas or dust. 
C)  are often associated with a galaxy that is colliding with another galaxy. 
D)  are common in rich clusters. 
E)  are composed of filaments and voids.

Question 20

How does the rotation curve method differ from the analysis of binary stars?

Accepted Answer

The answer of How does the rotation curve method differ...

Quasars are most common with redshifts

Our galaxy is not a radio galaxy, but it does emit radio energy. Explain where this radio energy comes from.

That the radio lobes radiate synchrotron radiation indicates that

If H equals 70 km/s/Mpc, then a galaxy with a radial velocity of 2100 km/s has a distance of approximately

Why can't evolution go from elliptical to spiral to irregular?

Most of the mass of a galaxy is contained in the

The Large and Small Magellanic Clouds are satellites galaxies of the Milky Way.

A mega-parsec (Mpc) is equivalent to

We suspect that quasars are the active centers of galaxies because

When a large galaxy collides with a small galaxy, the smaller galaxy may be pulled apart by tidal forces.

What observational evidence do we have that eruptions in the centers of galaxies involve magnetic fields?

Describe the kind of observations that have led astronomers to believe that supermassive black holes lie at the center of many galaxies.

The look-back time is

Why should we expect quasars to be small? How small should we expect them to be?

____ is (are) observed when light from a distant quasar travels past a massive galaxy between us and the quasar, and this light is focused to form two or more images of the same quasar.

Jet-shaped regions of radio and optical emission have been observed in

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.

Via the rotation curve method, we can estimate the mass of galaxies like M31 from

Starburst galaxies

How does the rotation curve method differ from the analysis of binary stars?

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

Quasars are most common with redshifts

Our galaxy is not a radio galaxy, but it does emit radio energy. Explain where this radio energy comes from.

That the radio lobes radiate synchrotron radiation indicates that

If H equals 70 km/s/Mpc, then a galaxy with a radial velocity of 2100 km/s has a distance of approximately

Why can't evolution go from elliptical to spiral to irregular?

Most of the mass of a galaxy is contained in the

The Large and Small Magellanic Clouds are satellites galaxies of the Milky Way.

A mega-parsec (Mpc) is equivalent to

We suspect that quasars are the active centers of galaxies because

When a large galaxy collides with a small galaxy, the smaller galaxy may be pulled apart by tidal forces.

What observational evidence do we have that eruptions in the centers of galaxies involve magnetic fields?

Describe the kind of observations that have led astronomers to believe that supermassive black holes lie at the center of many galaxies.

The look-back time is

Why should we expect quasars to be small? How small should we expect them to be?

____ is (are) observed when light from a distant quasar travels past a massive galaxy between us and the quasar, and this light is focused to form two or more images of the same quasar.

Jet-shaped regions of radio and optical emission have been observed in

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.

Via the rotation curve method, we can estimate the mass of galaxies like M31 from

Starburst galaxies

How does the rotation curve method differ from the analysis of binary stars?

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