Question 1

Which of the following describes the way that ring galaxies are believed to form?

Accepted Answer

A) when two galaxies of different sizes collide along a direction perpendicular to the larger galaxy's disk 
B) when two spiral galaxies collide,along a direction parallel to one galaxy's disk 
C) when two elliptical galaxies collide at a position offset from their centres 
D) when more than two galaxies collide at the same time, along a straight line 
A) when two galaxies of different sizes collide along a direction perpendicular to the larger galaxy's disk 
B) when two spiral galaxies collide,along a direction parallel to one galaxy's disk 
C) when two elliptical galaxies collide at a position offset from their centres 
D) when more than two galaxies collide at the same time, along a straight line

Question 2

Which of the following indicates that quasars must be small?

Accepted Answer

A) They have high radial velocities. 
B) They are surrounded by quasar fuzz. 
C) They radiate huge amounts of energy. 
D) They fluctuate rapidly on time scales as short as a few hours. 
A) They have high radial velocities. 
B) They are surrounded by quasar fuzz. 
C) They radiate huge amounts of energy. 
D) They fluctuate rapidly on time scales as short as a few hours.

Question 3

Which of the following are spiral galaxies that have small luminous nuclei?

Accepted Answer

A) active 
B) radio 
C) Seyfert 
D) blazar 
A) active 
B) radio 
C) Seyfert 
D) blazar

Question 4

Discuss the observational differences between spiral,elliptical,and irregular galaxies.

Accepted Answer

The answer of Discuss the observational differences between spiral,elliptical,and irregular...

Question 5

Where is most of the mass of a galaxy found?

Accepted Answer

A) in the massive O and B stars 
B) in the H II regions 
C) in the dark matter 
D) in the disk 
A) in the massive O and B stars 
B) in the H II regions 
C) in the dark matter 
D) in the disk

Question 6

The radio radiation emitted by a radio lobe is mainly synchrotron radiation.

Accepted Answer

A) True 
 B)False

Question 7

Double-lobed radio galaxies appear to be emitting jets of gas and radiation.

Accepted Answer

A) True 
 B)False

Question 8

What is the Coma cluster?

Accepted Answer

A) It is the galactic cluster that contains the Milky Way. 
B) It is the oldest known cluster of galaxies. 
C) It is a cluster that contains mostly spiral galaxies and very few elliptical galaxies. 
D) It is a rich cluster of galaxies near the Local Group. 
A) It is the galactic cluster that contains the Milky Way. 
B) It is the oldest known cluster of galaxies. 
C) It is a cluster that contains mostly spiral galaxies and very few elliptical galaxies. 
D) It is a rich cluster of galaxies near the Local Group.

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

Which type of active galaxy can be seen at the greatest distance?

Accepted Answer

A) Seyfert galaxies 
B) radio galaxies 
C) quasars 
D) BL Lac objects 
A) Seyfert galaxies 
B) radio galaxies 
C) quasars 
D) BL Lac objects

Question 11

If the redshifts of quasars arise from the expansion of the universe,yet they have brighter magnitudes than galaxies with the same redshifts,what must be generally true of quasars?

Accepted Answer

A) They are very small. 
B) They are within the Local Group. 
C) They are moving toward Earth with a large radial velocity. 
D) They emit a very large amount of energy per second. 
A) They are very small. 
B) They are within the Local Group. 
C) They are moving toward Earth with a large radial velocity. 
D) They emit a very large amount of energy per second.

Question 12

Why do we suspect that quasars are the active centres of galaxies?

Accepted Answer

A) "Fuzz" around the central luminous regions looks like a collection of normal stars. 
B) A few quasars have large redshifts. 
C) The central regions of some quasars fluctuate rapidly. 
D) Quasars emit large amounts of X-rays. 
A) "Fuzz" around the central luminous regions looks like a collection of normal stars. 
B) A few quasars have large redshifts. 
C) The central regions of some quasars fluctuate rapidly. 
D) Quasars emit large amounts of X-rays.

Question 13

The Hubble Law describes a relationship between two characteristics of a galaxy.What are they?

Accepted Answer

A) mass and luminosity 
B) distance and luminosity 
C) mass and recession velocity 
D) distance and recession velocity 
A) mass and luminosity 
B) distance and luminosity 
C) mass and recession velocity 
D) distance and recession velocity

Question 14

If a quasar has a redshift of 0.98,then it is receding from Earth at 98 percent of the speed of light.

Accepted Answer

A) True 
 B)False

Question 15

What is the defining feature of Seyfert galaxies?

Accepted Answer

A) They are more common in isolated galaxies than in close pairs of galaxies. 
B) They have spectra which show that gas in their cores is hot and moving quickly. 
C) They generally show redshifts greater than 6. 
D) They are a type of elliptical galaxy. 
A) They are more common in isolated galaxies than in close pairs of galaxies. 
B) They have spectra which show that gas in their cores is hot and moving quickly. 
C) They generally show redshifts greater than 6. 
D) They are a type of elliptical galaxy.

Question 16

The Local Group of galaxies is dominated by the presence of spiral galaxies.

Accepted Answer

A) True 
 B)False

Question 17

What kind of galaxies contain large clouds of gas and dust,and both young and old stars,but have no obvious spiral arms or nucleus?

Accepted Answer

A) irregular 
B) lenticular 
C) elliptical 
D) barred spiral 
A) irregular 
B) lenticular 
C) elliptical 
D) barred spiral

Question 18

What is indicated by the fact that the lobes in a double-lobed radio source radiate synchrotron radiation?

Accepted Answer

A) High speed electrons are spiralling 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. 
A) High speed electrons are spiralling 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.

Question 19

What does an elliptical galaxy contain?

Accepted Answer

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

Question 20

The hydrogen Balmer line Hb has a wavelength of 486.1 nanometres in the laboratory.The same line is observed in a quasar at 2430.5 nm.What is the change in wavelength (in nm)for the line in this quasar spectrum?

Accepted Answer

A) 0 
B) 486.1 
C) 1944.4 
D) 2430.5 
A) 0 
B) 486.1 
C) 1944.4 
D) 2430.5

Which of the following describes the way that ring galaxies are believed to form?

Which of the following indicates that quasars must be small?

Which of the following are spiral galaxies that have small luminous nuclei?

Discuss the observational differences between spiral,elliptical,and irregular galaxies.

Where is most of the mass of a galaxy found?

The radio radiation emitted by a radio lobe is mainly synchrotron radiation.

Double-lobed radio galaxies appear to be emitting jets of gas and radiation.

What is the Coma cluster?

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

Which type of active galaxy can be seen at the greatest distance?

If the redshifts of quasars arise from the expansion of the universe,yet they have brighter magnitudes than galaxies with the same redshifts,what must be generally true of quasars?

Why do we suspect that quasars are the active centres of galaxies?

The Hubble Law describes a relationship between two characteristics of a galaxy.What are they?

If a quasar has a redshift of 0.98,then it is receding from Earth at 98 percent of the speed of light.

What is the defining feature of Seyfert galaxies?

The Local Group of galaxies is dominated by the presence of spiral galaxies.

What kind of galaxies contain large clouds of gas and dust,and both young and old stars,but have no obvious spiral arms or nucleus?

What is indicated by the fact that the lobes in a double-lobed radio source radiate synchrotron radiation?

What does an elliptical galaxy contain?

The hydrogen Balmer line Hb has a wavelength of 486.1 nanometres in the laboratory.The same line is observed in a quasar at 2430.5 nm.What is the change in wavelength (in nm)for the line in this quasar spectrum?

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

Which of the following describes the way that ring galaxies are believed to form?

Which of the following indicates that quasars must be small?

Which of the following are spiral galaxies that have small luminous nuclei?

Discuss the observational differences between spiral,elliptical,and irregular galaxies.

Where is most of the mass of a galaxy found?

The radio radiation emitted by a radio lobe is mainly synchrotron radiation.

Double-lobed radio galaxies appear to be emitting jets of gas and radiation.

What is the Coma cluster?

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

Which type of active galaxy can be seen at the greatest distance?

If the redshifts of quasars arise from the expansion of the universe,yet they have brighter magnitudes than galaxies with the same redshifts,what must be generally true of quasars?

Why do we suspect that quasars are the active centres of galaxies?

The Hubble Law describes a relationship between two characteristics of a galaxy.What are they?

If a quasar has a redshift of 0.98,then it is receding from Earth at 98 percent of the speed of light.

What is the defining feature of Seyfert galaxies?

The Local Group of galaxies is dominated by the presence of spiral galaxies.

What kind of galaxies contain large clouds of gas and dust,and both young and old stars,but have no obvious spiral arms or nucleus?

What is indicated by the fact that the lobes in a double-lobed radio source radiate synchrotron radiation?

What does an elliptical galaxy contain?

The hydrogen Balmer line Hb has a wavelength of 486.1 nanometres in the laboratory.The same line is observed in a quasar at 2430.5 nm.What is the change in wavelength (in nm)for the line in this quasar spectrum?

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