Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

The galaxy shown above in visual wavelengths is an example of a/an _________-type.

Accepted Answer

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

Question 3

When discovered in the 1960's, a(n) ___________ was found to emit large amounts of energy, but through visual and radio telescopes appeared to be a single point of light much like a star.

Accepted Answer

A)  a planet like Venus 
B)  E galaxy 
C)  spiral galaxy 
D)  double-lobed radio galaxy 
E)  quasar 
A)  a planet like Venus 
B)  E galaxy 
C)  spiral galaxy 
D)  double-lobed radio galaxy 
E)  quasar

Question 4

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 the other choices are correct. 
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 the other choices are correct.

Question 5

​
The shells indicated in the enhanced visual wavelength image shown above are formed from _____________.

Accepted Answer

A)  quasars 
B)  mergers of galaxies 
C)  tides 
D)  spiral arms 
A)  quasars 
B)  mergers of galaxies 
C)  tides 
D)  spiral arms

Question 6

Seyfert galaxies

Accepted Answer

A)  are more common in close pairs of galaxies than in isolated systems. 
B)  emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. 
C)  generally show redshifts greater than 6. 
D)  are more common in close pairs of galaxies than in isolated systems and emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. 
E)  are more common in close pairs of galaxies than in isolated systems; emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies; and generally show redshifts greater than 6. 
A)  are more common in close pairs of galaxies than in isolated systems. 
B)  emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. 
C)  generally show redshifts greater than 6. 
D)  are more common in close pairs of galaxies than in isolated systems and emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. 
E)  are more common in close pairs of galaxies than in isolated systems; emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies; and generally show redshifts greater than 6.

Question 7

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

Accepted Answer

Q uasars fluctuate rapidly whi

Question 8

____________ 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 9

How do astronomers know that the luminous regions of active nuclei of active galaxies are very small?

Accepted Answer

A)  Their nuclei are much brighter than expected. 
B)  The orbits of stars near the center of the galactic nuclei are faster than expected. 
C)  The luminosity of the nuclei varies over short times. 
D)  The color of the nuclei is different than expected. 
A)  Their nuclei are much brighter than expected. 
B)  The orbits of stars near the center of the galactic nuclei are faster than expected. 
C)  The luminosity of the nuclei varies over short times. 
D)  The color of the nuclei is different than expected.

Question 10

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 11

Recent high resolution radio observations show that quasars can be classified as

Accepted Answer

A)  exploding supernova stars. 
B)  exploding planets. 
C)  normal galaxies like our Milky Way Galaxy. 
D)  a kind of active galaxy similar to Seyfert and radio galaxies. 
A)  exploding supernova stars. 
B)  exploding planets. 
C)  normal galaxies like our Milky Way Galaxy. 
D)  a kind of active galaxy similar to Seyfert and radio galaxies.

Question 12

The rotation curve of a galaxy can be used to determine

Accepted Answer

A)  the relative number of hot young stars in the galaxy. 
B)  the relative amount of gas and dust in the galaxy. 
C)  the radius of the galaxy. 
D)  the luminosity of the galaxy. 
E)  the mass of the galaxy. 
A)  the relative number of hot young stars in the galaxy. 
B)  the relative amount of gas and dust in the galaxy. 
C)  the radius of the galaxy. 
D)  the luminosity of the galaxy. 
E)  the mass of the galaxy.

Question 13

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 14

Which one of the words below is a name for a type of galaxy in the Hubble classification system?

Accepted Answer

A)  red giant 
B)  visual 
C)  spiral 
D)  21-centimeter 
E)  statuesque 
A)  red giant 
B)  visual 
C)  spiral 
D)  21-centimeter 
E)  statuesque

Question 15

The look-back time is numerically equal to the distance to a galaxy in light-years.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

​ 
​ 
Although there are a few ways to e

Question 17

Redshift values of ____ to _____ are distances to when galaxies were growing and merging,

Accepted Answer

The answer of Redshift values of ____ to _____ are...

Question 18

The mass of a single galaxy might be found by

Accepted Answer

A)  the double galaxy method. 
B)  the rotation curve method. 
C)  the cluster method. 
D)  any of the methods (i.e., double galaxy, rotation curve, cluster) 
E)  none of these methods. 
A)  the double galaxy method. 
B)  the rotation curve method. 
C)  the cluster method. 
D)  any of the methods (i.e., double galaxy, rotation curve, cluster) 
E)  none of these methods.

Question 19

Why are there few quasars at low redshifts and at high redshifts but many at redshifts of about 2?

Accepted Answer

​ 
Quasars are most common with redshift

Question 20

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.

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

The galaxy shown above in visual wavelengths is an example of a/an _________-type.

When discovered in the 1960's, a(n) ___________ was found to emit large amounts of energy, but through visual and radio telescopes appeared to be a single point of light much like a star.

Galactic cannibalism refers to

The shells indicated in the enhanced visual wavelength image shown above are formed from _____________.

Seyfert galaxies

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

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

How do astronomers know that the luminous regions of active nuclei of active galaxies are very small?

What factors are important when trying to classify a spiral galaxy?

Recent high resolution radio observations show that quasars can be classified as

The rotation curve of a galaxy can be used to determine

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

Which one of the words below is a name for a type of galaxy in the Hubble classification system?

The look-back time is numerically equal to the distance to a galaxy in light-years.

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

Redshift values of to _ are distances to when galaxies were growing and merging,

The mass of a single galaxy might be found by

Why are there few quasars at low redshifts and at high redshifts but many at redshifts of about 2?

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

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

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

The galaxy shown above in visual wavelengths is an example of a/an _________-type.

When discovered in the 1960's, a(n) ___________ was found to emit large amounts of energy, but through visual and radio telescopes appeared to be a single point of light much like a star.

Galactic cannibalism refers to

​ The shells indicated in the enhanced visual wavelength image shown above are formed from _____________.

Seyfert galaxies

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

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

How do astronomers know that the luminous regions of active nuclei of active galaxies are very small?

What factors are important when trying to classify a spiral galaxy?

Recent high resolution radio observations show that quasars can be classified as

The rotation curve of a galaxy can be used to determine

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

Which one of the words below is a name for a type of galaxy in the Hubble classification system?

The look-back time is numerically equal to the distance to a galaxy in light-years.

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

Redshift values of ____ to _____ are distances to when galaxies were growing and merging,

The mass of a single galaxy might be found by

Why are there few quasars at low redshifts and at high redshifts but many at redshifts of about 2?

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

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 shells indicated in the enhanced visual wavelength image shown above are formed from _____________.

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

Redshift values of to _ are distances to when galaxies were growing and merging,