Question 1

How does the study of quasars reveal information about the history of the universe?

Accepted Answer

A) Quasars are very distant, so we see them as they were in the past. 
B) Quasars contain stars of all ages. 
C) Quasars typically act as host galaxies for gravitational lensing. 
D) Quasars generate their energy in very small volumes of space. 
A) Quasars are very distant, so we see them as they were in the past. 
B) Quasars contain stars of all ages. 
C) Quasars typically act as host galaxies for gravitational lensing. 
D) Quasars generate their energy in very small volumes of space.

Question 2

The ____________________ describes blazars,Seyferts,and radio lobe galaxies as being produced by a dense disk of gas and a hot accretion disk around a supermassive black hole at the core of a galaxy.

Accepted Answer

The answer of The ____________________ describes blazars,Seyferts,and radio lobe galaxies...

Question 3

____________________ galaxies have a definite disk component,but contain no evidence of spiral pattern,few hot young stars,and little gas and dust.

Accepted Answer

The answer of ____________________ galaxies have a definite disk component,but...

Question 4

What is the most common redshift of quasars?

Accepted Answer

A) less than 0.1 
B) 0.1 to 0.5 
C) about 2 
D) greater than 6 
A) less than 0.1 
B) 0.1 to 0.5 
C) about 2 
D) greater than 6

Question 5

Due to the extremely rapid orbital velocities of material near the centres of many galaxies,these galaxies are believed to contain ____________________ at their centres.

Accepted Answer

a supermas

Question 6

What do tidal tails,multiple nuclei,and shells of stars have in common?

Accepted Answer

A) All are found in clusters of galaxies. 
B) All are found near active galactic nuclei. 
C) All are characteristics of spiral galaxies. 
D) All are related to galaxy interactions. 
A) All are found in clusters of galaxies. 
B) All are found near active galactic nuclei. 
C) All are characteristics of spiral galaxies. 
D) All are related to galaxy interactions.

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

What evidence do we have that active galaxies are powered by black holes at their centres?

Accepted Answer

Active galaxies are characterized by the

Question 9

What does the term "galactic cannibalism" refer 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 
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

Question 10

What does a spiral (S or SB)galaxy contain?

Accepted Answer

A) mostly lower main-sequence stars and giants 
B) upper and lower main-sequence stars, gas and dust 
C) mostly upper main-sequence stars, gas and dust 
D) mostly upper main-sequence stars 
A) mostly lower main-sequence stars and giants 
B) upper and lower main-sequence stars, gas and dust 
C) mostly upper main-sequence stars, gas and dust 
D) mostly upper main-sequence stars

Question 11

Where was gravitational lensing first observed?

Accepted Answer

A) near the Sun during an eclipse 
B) in galaxy clusters 
C) in a prism held by Newton 
D) in quasars 
A) near the Sun during an eclipse 
B) in galaxy clusters 
C) in a prism held by Newton 
D) in quasars

Question 12

Which of the following is an irregular galaxy that is passing close to the Milky Way and is expected to merge with the Milky Way in the future?

Accepted Answer

A) the Andromeda galaxy 
B) the Small Magellanic Cloud 
C) M87 
D) the Whirlpool galaxy 
A) the Andromeda galaxy 
B) the Small Magellanic Cloud 
C) M87 
D) the Whirlpool galaxy

Question 13

How did the discovery of gravitational lensing affect our knowledge of quasars?

Accepted Answer

A) It showed that some quasars are located within the Local Group of galaxies. 
B) It showed that quasars are located in the halo of the Milky Way. 
C) It showed that quasars are much farther away than the distant galaxies that form the gravitational lenses. 
D) It proved the existence of super-massive black holes at the centres of active galactic nuclei. 
A) It showed that some quasars are located within the Local Group of galaxies. 
B) It showed that quasars are located in the halo of the Milky Way. 
C) It showed that quasars are much farther away than the distant galaxies that form the gravitational lenses. 
D) It proved the existence of super-massive black holes at the centres of active galactic nuclei.

Question 14

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

Accepted Answer

The answer of Why can't galaxy evolution go from elliptical...

Question 15

What does an irregular galaxy contain?

Accepted Answer

A) mostly lower main-sequence stars and giants 
B) mostly upper main-sequence stars and giants 
C) mostly upper main-sequence stars and gas and dust 
D) upper and lower main-sequence stars and gas and dust 
A) mostly lower main-sequence stars and giants 
B) mostly upper main-sequence stars and giants 
C) mostly upper main-sequence stars and gas and dust 
D) upper and lower main-sequence stars and gas and dust

Question 16

Which of the following emits large amounts of energy,but photographically appears to be a single point of light,much like a star?

Accepted Answer

A) an elliptical galaxy 
B) a spiral galaxy 
C) a double-lobed radio source 
D) a quasar 
A) an elliptical galaxy 
B) a spiral galaxy 
C) a double-lobed radio source 
D) a quasar

Question 17

What is a mega-parsec equivalent to?

Accepted Answer

A) 3.26 light years 
B) 206,265 AU 
C) 1000 parsecs 
D) 3.26 million light years 
A) 3.26 light years 
B) 206,265 AU 
C) 1000 parsecs 
D) 3.26 million light years

Question 18

How does the unified model of active galactic nuclei (AGN)explain blazars?

Accepted Answer

A) Blazars are Seyfert galaxies seen edge-on. 
B) Blazars are regions of the intergalactic medium where gas has been heated by a nearby AGN. 
C) Blazars are relativistic jets from an AGN pointed toward our light of sight. 
D) Blazars are newly formed AGNs from a recent galactic collision. 
A) Blazars are Seyfert galaxies seen edge-on. 
B) Blazars are regions of the intergalactic medium where gas has been heated by a nearby AGN. 
C) Blazars are relativistic jets from an AGN pointed toward our light of sight. 
D) Blazars are newly formed AGNs from a recent galactic collision.

Question 19

The Large and Small Magellanic clouds are satellite galaxies of the Milky Way.

Accepted Answer

A) True 
 B)False

Question 20

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

How does the study of quasars reveal information about the history of the universe?

The ____________________ describes blazars,Seyferts,and radio lobe galaxies as being produced by a dense disk of gas and a hot accretion disk around a supermassive black hole at the core of a galaxy.

____________________ galaxies have a definite disk component,but contain no evidence of spiral pattern,few hot young stars,and little gas and dust.

What is the most common redshift of quasars?

Due to the extremely rapid orbital velocities of material near the centres of many galaxies,these galaxies are believed to contain ____________________ at their centres.

What do tidal tails,multiple nuclei,and shells of stars have in common?

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

What evidence do we have that active galaxies are powered by black holes at their centres?

What does the term "galactic cannibalism" refer to?

What does a spiral (S or SB)galaxy contain?

Where was gravitational lensing first observed?

Which of the following is an irregular galaxy that is passing close to the Milky Way and is expected to merge with the Milky Way in the future?

How did the discovery of gravitational lensing affect our knowledge of quasars?

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

What does an irregular galaxy contain?

Which of the following emits large amounts of energy,but photographically appears to be a single point of light,much like a star?

What is a mega-parsec equivalent to?

How does the unified model of active galactic nuclei (AGN)explain blazars?

The Large and Small Magellanic clouds are satellite galaxies of the Milky Way.

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

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Family of Stars

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

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Exam 10: Galaxies

How does the study of quasars reveal information about the history of the universe?

The ____________________ describes blazars,Seyferts,and radio lobe galaxies as being produced by a dense disk of gas and a hot accretion disk around a supermassive black hole at the core of a galaxy.

____________________ galaxies have a definite disk component,but contain no evidence of spiral pattern,few hot young stars,and little gas and dust.

What is the most common redshift of quasars?

Due to the extremely rapid orbital velocities of material near the centres of many galaxies,these galaxies are believed to contain ____________________ at their centres.

What do tidal tails,multiple nuclei,and shells of stars have in common?

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

What evidence do we have that active galaxies are powered by black holes at their centres?

What does the term "galactic cannibalism" refer to?

What does a spiral (S or SB)galaxy contain?

Where was gravitational lensing first observed?

Which of the following is an irregular galaxy that is passing close to the Milky Way and is expected to merge with the Milky Way in the future?

How did the discovery of gravitational lensing affect our knowledge of quasars?

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

What does an irregular galaxy contain?

Which of the following emits large amounts of energy,but photographically appears to be a single point of light,much like a star?

What is a mega-parsec equivalent to?

How does the unified model of active galactic nuclei (AGN)explain blazars?

The Large and Small Magellanic clouds are satellite galaxies of the Milky Way.

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

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Family of Stars

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

Filters