Question 1

We should expect galaxies to collide fairly often because

Accepted Answer

A)  they are large with respect to their separation distances. 
B)  galaxies contain large amounts of neutral hydrogen. 
C)  galaxies occur in clusters. 
D)  they are large with respect to their separation distances and galaxies occur in clusters. 
E)  None of the other choices are correct. 
A)  they are large with respect to their separation distances. 
B)  galaxies contain large amounts of neutral hydrogen. 
C)  galaxies occur in clusters. 
D)  they are large with respect to their separation distances and galaxies occur in clusters. 
E)  None of the other choices are correct.

Question 2

The graph above indicates that from -30 to -10 kpc, a spiral galaxy is rotating __________ us whereas from 10 to 30 kpc, the spiral galaxy is rotating __________ from us.

Accepted Answer

A)  toward, away 
B)  away, away 
C)  toward, toward 
D)  away, toward 
A)  toward, away 
B)  away, away 
C)  toward, toward 
D)  away, toward

Question 3

The above visual wavelength image is that of an S0 galaxy.

Accepted Answer

A) True 
 B)False

Question 4

This star-like radio-quiet object shown above in visual wavelengths is actually a/an _____________.

Accepted Answer

A)  elliptical galaxy 
B)  spiral galaxy 
C)  Seyfert 
D)  quasar 
A)  elliptical galaxy 
B)  spiral galaxy 
C)  Seyfert 
D)  quasar

Question 5

___________ 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 6

If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth?

Accepted Answer

A)  Galaxy A is four times closer than Galaxy B. 
B)  Galaxy A is four times further away than Galaxy B. 
C)  Galaxy A is twice as distant than Galaxy B. 
D)  Galaxy A is twice as close than Galaxy B. 
A)  Galaxy A is four times closer than Galaxy B. 
B)  Galaxy A is four times further away than Galaxy B. 
C)  Galaxy A is twice as distant than Galaxy B. 
D)  Galaxy A is twice as close than Galaxy B.

Question 7

The above visual wavelength image of a small but very luminous star-like nucleus is an example of a Seyfert.

Accepted Answer

A) True 
 B)False

Question 8

Statistical evidence

Accepted Answer

A)  can be used to draw conclusions about a specific cases. 
B)  is applicable to classes of objects where only a few objects from the class have been studied. 
C)  allows scientists to determine the mechanism that produces the dust ring in Centaurus A. 
D)  allows scientists to deduce general characteristics about a class of objects with similar properties. 
E)  provides insight into the behavior of an individual object based on careful observations of it. 
A)  can be used to draw conclusions about a specific cases. 
B)  is applicable to classes of objects where only a few objects from the class have been studied. 
C)  allows scientists to determine the mechanism that produces the dust ring in Centaurus A. 
D)  allows scientists to deduce general characteristics about a class of objects with similar properties. 
E)  provides insight into the behavior of an individual object based on careful observations of it.

Question 9

According to the unified model of active galactic nuclei, ___________ is in the center surrounded by _____________with a Type 1 Seyfert or Type 2 Seyfert being seen depending on the viewing angle.

Accepted Answer

A)  a supermassive black hole; an accretion disk 
B)  a supermassive black hole; empty space 
C)  no black hole; an accretion disk 
D)  no black hole; empty space 
A)  a supermassive black hole; an accretion disk 
B)  a supermassive black hole; empty space 
C)  no black hole; an accretion disk 
D)  no black hole; empty space

Question 10

The above visual wavelength image is of a/an ____________-type galaxy.

Accepted Answer

A)  S0 
B)  elliptical 
C)  barred spiral 
D)  spiral (non-barred) 
A)  S0 
B)  elliptical 
C)  barred spiral 
D)  spiral (non-barred)

Question 11

Active galaxies are thought to have _______ in their centers.

Accepted Answer

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

Question 12

Why is the number of galaxies in the Local Group uncertain?

Accepted Answer

​ 
The total number of galaxie

Question 13

The figure shows an image of a galaxy at dust-penetrating wavelengths. It can be classified as which one of the following galactic types?

Accepted Answer

A)  spiral 
B)  irregular 
C)  elliptical 
D)  red giant 
A)  spiral 
B)  irregular 
C)  elliptical 
D)  red giant

Question 14

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

Question 15

The above (enhanced) visual wavelength image indicates galactic cannibalism has occurred.

Accepted Answer

A) True 
 B)False

Question 16

_______________ 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 17

It is believed that ring galaxies form

Accepted Answer

A)  when two galaxies collide at high speeds. 
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 at high speeds. 
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 18

If Hubble's constant is taken to be 70 km/s/Mpc, and a quasar is found with a radial velocity of 0.95 times the speed of light, how far away is the quasar?

Accepted Answer

A)  4100 Mpc 
B)  0.014 Mpc 
C)  67 Mpc 
D)  74 Mpc 
E)  300,000 Mpc 
A)  4100 Mpc 
B)  0.014 Mpc 
C)  67 Mpc 
D)  74 Mpc 
E)  300,000 Mpc

Question 19

The Milky Way is part of
I. a poor cluster.
II. a rich cluster.
III. the Virgo Cluster.
IV. the Local Group.

Accepted Answer

A)  I and III 
B)  I and IV 
C)  II and III 
D)  II and IV 
E)  just III 
A)  I and III 
B)  I and IV 
C)  II and III 
D)  II and IV 
E)  just III

Question 20

The Andromeda spiral galaxy is almost edge-on to us. Astronomers have detected the orbital motion of this and other such galaxies' disk material by

Accepted Answer

A)  using Hubble's law. 
B)  measuring Doppler shifts of different parts  of the disk. 
C)  the steady state theory. 
D)  measuring Doppler shifts of different parts of the disk. 
A)  using Hubble's law. 
B)  measuring Doppler shifts of different parts  of the disk. 
C)  the steady state theory. 
D)  measuring Doppler shifts of different parts of the disk.

We should expect galaxies to collide fairly often because

The graph above indicates that from -30 to -10 kpc, a spiral galaxy is rotating us whereas from 10 to 30 kpc, the spiral galaxy is rotating from us.

The above visual wavelength image is that of an S0 galaxy.

This star-like radio-quiet object shown above in visual wavelengths is actually a/an _____________.

___________ 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.

If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth?

The above visual wavelength image of a small but very luminous star-like nucleus is an example of a Seyfert.

Statistical evidence

According to the unified model of active galactic nuclei, _ is in the center surrounded by ___with a Type 1 Seyfert or Type 2 Seyfert being seen depending on the viewing angle.

The above visual wavelength image is of a/an ____________-type galaxy.

Active galaxies are thought to have _______ in their centers.

Why is the number of galaxies in the Local Group uncertain?

The figure shows an image of a galaxy at dust-penetrating wavelengths. It can be classified as which one of the following galactic types?

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

The above (enhanced) visual wavelength image indicates galactic cannibalism has occurred.

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

It is believed that ring galaxies form

If Hubble's constant is taken to be 70 km/s/Mpc, and a quasar is found with a radial velocity of 0.95 times the speed of light, how far away is the quasar?

The Milky Way is part of I. a poor cluster. II. a rich cluster. III. the Virgo Cluster. IV. the Local Group.

The Andromeda spiral galaxy is almost edge-on to us. Astronomers have detected the orbital motion of this and other such galaxies' disk material by

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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

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Exam 13: Galaxies: Normal and Active

We should expect galaxies to collide fairly often because

The graph above indicates that from -30 to -10 kpc, a spiral galaxy is rotating __________ us whereas from 10 to 30 kpc, the spiral galaxy is rotating __________ from us.

The above visual wavelength image is that of an S0 galaxy.

This star-like radio-quiet object shown above in visual wavelengths is actually a/an _____________.

___________ 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.

If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth?

The above visual wavelength image of a small but very luminous star-like nucleus is an example of a Seyfert.

Statistical evidence

According to the unified model of active galactic nuclei, ___________ is in the center surrounded by _____________with a Type 1 Seyfert or Type 2 Seyfert being seen depending on the viewing angle.

The above visual wavelength image is of a/an ____________-type galaxy.

Active galaxies are thought to have _______ in their centers.

Why is the number of galaxies in the Local Group uncertain?

The figure shows an image of a galaxy at dust-penetrating wavelengths. It can be classified as which one of the following galactic types?

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

The above (enhanced) visual wavelength image indicates galactic cannibalism has occurred.

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

It is believed that ring galaxies form

If Hubble's constant is taken to be 70 km/s/Mpc, and a quasar is found with a radial velocity of 0.95 times the speed of light, how far away is the quasar?

The Milky Way is part of I. a poor cluster. II. a rich cluster. III. the Virgo Cluster. IV. the Local Group.

The Andromeda spiral galaxy is almost edge-on to us. Astronomers have detected the orbital motion of this and other such galaxies' disk material by

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

The graph above indicates that from -30 to -10 kpc, a spiral galaxy is rotating us whereas from 10 to 30 kpc, the spiral galaxy is rotating from us.

According to the unified model of active galactic nuclei, _ is in the center surrounded by ___with a Type 1 Seyfert or Type 2 Seyfert being seen depending on the viewing angle.