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

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 3

The energy from an AGN is produced by

Accepted Answer

A) the collision of two spiral galaxies. 
B) the collision of two elliptical galaxies. 
C) the collision of two radio jets. 
D) matter flowing into a supermassive black hole. 
E) supernovae. 
A) the collision of two spiral galaxies. 
B) the collision of two elliptical galaxies. 
C) the collision of two radio jets. 
D) matter flowing into a supermassive black hole. 
E) supernovae.

Question 4

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 5

What factors are important when trying to classify a spiral galaxy

Accepted Answer

A) amount of dust and gas in the galaxy 
B) structure of the spiral arms 
C) size of the central region 
D) All of the other choices are important. 
A) amount of dust and gas in the galaxy 
B) structure of the spiral arms 
C) size of the central region 
D) All of the other choices are important.

Question 6

What observational evidence do we have that quasars are the centers of very distant galaxies

Accepted Answer

Telescopes in space and on Earth's surfa

Question 7

____________ galaxies contain a supermassive black hole at their centers while active nuclei are present in ____________of galaxies

Accepted Answer

A) Most; a few percent 
B) Most; the majority 
C) A small minority; a few percent 
D) A small minority; the majority 
A) Most; a few percent 
B) Most; the majority 
C) A small minority; a few percent 
D) A small minority; the majority

Question 8

Most galaxies appear to be

Accepted Answer

A) composed of one star and seven planets. 
B) inside our Milky Way. 
C) located on the Earth. 
D) moving toward us. 
E) moving away from us. 
A) composed of one star and seven planets. 
B) inside our Milky Way. 
C) located on the Earth. 
D) moving toward us. 
E) moving away from us.

Question 9

How are astronomers able to determine that quasars are so small

Accepted Answer

A) They are variable over a short period of time. 
B) They emit mainly X-rays. 
C) They are only found at very large distance. 
D) The structure of a quasar is completely resolved in images. 
A) They are variable over a short period of time. 
B) They emit mainly X-rays. 
C) They are only found at very large distance. 
D) The structure of a quasar is completely resolved in images.

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

The blue sharp point of light with diffraction spikes in the upper right corner of the visual + NIR image of the Hubble Deep Field, shown above, is a star in our Milky Way Galaxy.

Accepted Answer

A) True 
 B)False

Question 12

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 13

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 14

in the following 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 15

What is the major observational difference between a Seyfert galaxy and a normal spiral galaxy

Accepted Answer

A) Normal spiral galaxies usually have shorter spiral arms. 
B) Normal spiral galaxies never contain a supermassive black hole at their center. 
C) The central region of a Seyfert galaxy is much brighter. 
D) Seyfert galaxies don't contain any star formation. 
A) Normal spiral galaxies usually have shorter spiral arms. 
B) Normal spiral galaxies never contain a supermassive black hole at their center. 
C) The central region of a Seyfert galaxy is much brighter. 
D) Seyfert galaxies don't contain any star formation.

Question 16

________________ emit radio energy from areas on either side of the galaxy that are inflated by jets.

Accepted Answer

Double-lob

Question 17

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 18

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

Accepted Answer

Measurements show that the stars near th

Question 19

The above visual wavelength image shows galaxies interacting.

Accepted Answer

A) True 
 B)False

Question 20

What distance method did Edwin Hubble use to determine the distance to local galaxies

Accepted Answer

A) Hubble law 
B) supernova observations 
C) period-luminosity relationship of variable stars 
D) parallax 
A) Hubble law 
B) supernova observations 
C) period-luminosity relationship of variable stars 
D) parallax

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

We should expect galaxies to collide fairly often because

The energy from an AGN is produced by

That the radio lobes radiate synchrotron radiation indicates that

What factors are important when trying to classify a spiral galaxy

What observational evidence do we have that quasars are the centers of very distant galaxies

galaxies contain a supermassive black hole at their centers while active nuclei are present in of galaxies

Most galaxies appear to be

How are astronomers able to determine that quasars are so small

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

Most of the mass of a galaxy is contained in the

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

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

What is the major observational difference between a Seyfert galaxy and a normal spiral galaxy

________________ emit radio energy from areas on either side of the galaxy that are inflated by jets.

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.

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

The above visual wavelength image shows galaxies interacting.

What distance method did Edwin Hubble use to determine the distance to local galaxies

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.

We should expect galaxies to collide fairly often because

The energy from an AGN is produced by

That the radio lobes radiate synchrotron radiation indicates that

What factors are important when trying to classify a spiral galaxy

What observational evidence do we have that quasars are the centers of very distant galaxies

____________ galaxies contain a supermassive black hole at their centers while active nuclei are present in ____________of galaxies

Most galaxies appear to be

How are astronomers able to determine that quasars are so small

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

The blue sharp point of light with diffraction spikes in the upper right corner of the visual + NIR image of the Hubble Deep Field, shown above, is a star in our Milky Way Galaxy.

Most of the mass of a galaxy is contained in the

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

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

What is the major observational difference between a Seyfert galaxy and a normal spiral galaxy

________________ emit radio energy from areas on either side of the galaxy that are inflated by jets.

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.

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

The above visual wavelength image shows galaxies interacting.

What distance method did Edwin Hubble use to determine the distance to local galaxies

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

galaxies contain a supermassive black hole at their centers while active nuclei are present in of galaxies

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.