Question 1

Stars in elliptical galaxies that appear spherical in shape have velocities that:

Accepted Answer

A)  are random in direction 
B)  are very large in size 
C)  are equal in all directions 
D)  are constant in time 
A)  are random in direction 
B)  are very large in size 
C)  are equal in all directions 
D)  are constant in time

Question 2

We know AGN are about the size of our Solar System because of imaging done with the Hubble Space Telescope.

Accepted Answer

A) True 
 B)False

Question 3

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

Accepted Answer

A Seyfert galaxy contains a ve

Question 4

Elliptical galaxies appear red because:

Accepted Answer

A)  they are moving away from us 
B)  they contain mostly ionized hydrogen gas 
C)  they contain mostly old stars 
D)  they contain lots of dust 
A)  they are moving away from us 
B)  they contain mostly ionized hydrogen gas 
C)  they contain mostly old stars 
D)  they contain lots of dust

Question 5

By what are the real shapes of galaxies defined?

Accepted Answer

They are defined by

Question 6

Quasars were first discovered in which region of the electromagnetic spectrum?

Accepted Answer

A)  X-ray 
B)  Cosmic ray 
C)  Radio 
D)  Infrared 
A)  X-ray 
B)  Cosmic ray 
C)  Radio 
D)  Infrared

Question 7

Seyfert galaxies are unique because they have large lobes of radio emission that extend well beyond the visible part of the galaxy.

Accepted Answer

A) True 
 B)False

Question 8

We classify galaxies by:

Accepted Answer

A)  their true shapes 
B)  how they appear in the sky 
C)  the amount of gas and dust in them 
D)  whether they are near or far from us 
A)  their true shapes 
B)  how they appear in the sky 
C)  the amount of gas and dust in them 
D)  whether they are near or far from us

Question 9

Give three examples of types of active galactic nuclei and give one reason why each is unique.

Accepted Answer

Three types of AGN: (1)Quasars-extremely

Question 10

We can determine the 3-dimensional shape of any individual elliptical galaxy by photographing it.

Accepted Answer

A) True 
 B)False

Question 11

The unified model of AGN suggests that quasars,Seyfert galaxies,and radio galaxies:

Accepted Answer

A)  are similar phenomena but viewed from different orientation angles 
B)  are powered by similar mass accretion rates onto supermassive black holes 
C)  are driven by violent mergers of two gas-rich spiral galaxies 
D)  are unrelated,although they are all very luminous galaxies at radio wavelengths 
A)  are similar phenomena but viewed from different orientation angles 
B)  are powered by similar mass accretion rates onto supermassive black holes 
C)  are driven by violent mergers of two gas-rich spiral galaxies 
D)  are unrelated,although they are all very luminous galaxies at radio wavelengths

Question 12

The observed redshifts of quasars tell us all of the following EXCEPT:

Accepted Answer

A)  quasars are extremely luminous 
B)  quasars are rare in the universe today 
C)  quasars are incredibly far from us 
D)  quasars are extremely massive 
A)  quasars are extremely luminous 
B)  quasars are rare in the universe today 
C)  quasars are incredibly far from us 
D)  quasars are extremely massive

Question 13

If a Seyfert galaxy's nucleus varies in brightness on the timescale of 10 hours,then approximately what is the size of the emitting region?

Accepted Answer

A)  20 AU 
B)  70 AU 
C)  90 AU 
D)  140 AU 
A)  20 AU 
B)  70 AU 
C)  90 AU 
D)  140 AU

Question 14

What is the most likely candidate for making up the dark matter in galaxies?

Accepted Answer

The most likely source of the

Question 15

Long-lasting spiral density waves occur in the disk of a spiral galaxy when:

Accepted Answer

A)  the spiral merges with another galaxy 
B)  the galaxy is too close 
C)  the galaxy's disk is regularly disturbed 
D)  none of the above 
A)  the spiral merges with another galaxy 
B)  the galaxy is too close 
C)  the galaxy's disk is regularly disturbed 
D)  none of the above

Question 16

Spiral structure can be triggered in a disk galaxy by:

Accepted Answer

A)  a close encounter with a passing galaxy 
B)  an orbiting dwarf galaxy 
C)  an off-center burst of star formation in the disk 
D)  all of the above 
A)  a close encounter with a passing galaxy 
B)  an orbiting dwarf galaxy 
C)  an off-center burst of star formation in the disk 
D)  all of the above

Question 17

Which of the following is NOT a difference between spiral and elliptical galaxies?

Accepted Answer

A)  Spiral galaxies still have ongoing star formation whereas elliptical galaxies do not. 
B)  Spiral galaxies have dark matter halos whereas elliptical galaxies do not. 
C)  Spiral galaxy disks contain lots of cold gas and dust whereas elliptical galaxies do not. 
D)  Spiral galaxies tend to be bluish whereas elliptical galaxies tend to be reddish. 
A)  Spiral galaxies still have ongoing star formation whereas elliptical galaxies do not. 
B)  Spiral galaxies have dark matter halos whereas elliptical galaxies do not. 
C)  Spiral galaxy disks contain lots of cold gas and dust whereas elliptical galaxies do not. 
D)  Spiral galaxies tend to be bluish whereas elliptical galaxies tend to be reddish.

Question 18

The Hubble tuning fork diagram (figure below)represents an evolutionary diagram of galaxies from elliptical to spiral.

Accepted Answer

A) True 
 B)False

Question 19

What do the formation of the Solar System and the existence of AGNs have in common?

Accepted Answer

A)  They both demonstrate the importance of how luminosity varies with time. 
B)  They both demonstrate the high efficiency of nuclear fusion. 
C)  They both demonstrate the importance of accretion disks. 
D)  They both demonstrate the importance of living in the center of a galaxy. 
A)  They both demonstrate the importance of how luminosity varies with time. 
B)  They both demonstrate the high efficiency of nuclear fusion. 
C)  They both demonstrate the importance of accretion disks. 
D)  They both demonstrate the importance of living in the center of a galaxy.

Question 20

The type of AGN we see depends mostly on the angle at which we view the galaxy.

Accepted Answer

A) True 
 B)False

Stars in elliptical galaxies that appear spherical in shape have velocities that:

We know AGN are about the size of our Solar System because of imaging done with the Hubble Space Telescope.

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

Elliptical galaxies appear red because:

By what are the real shapes of galaxies defined?

Quasars were first discovered in which region of the electromagnetic spectrum?

Seyfert galaxies are unique because they have large lobes of radio emission that extend well beyond the visible part of the galaxy.

We classify galaxies by:

Give three examples of types of active galactic nuclei and give one reason why each is unique.

We can determine the 3-dimensional shape of any individual elliptical galaxy by photographing it.

The unified model of AGN suggests that quasars,Seyfert galaxies,and radio galaxies:

The observed redshifts of quasars tell us all of the following EXCEPT:

If a Seyfert galaxy's nucleus varies in brightness on the timescale of 10 hours,then approximately what is the size of the emitting region?

What is the most likely candidate for making up the dark matter in galaxies?

Long-lasting spiral density waves occur in the disk of a spiral galaxy when:

Spiral structure can be triggered in a disk galaxy by:

Which of the following is NOT a difference between spiral and elliptical galaxies?

The Hubble tuning fork diagram (figure below)represents an evolutionary diagram of galaxies from elliptical to spiral.

What do the formation of the Solar System and the existence of AGNs have in common?

The type of AGN we see depends mostly on the angle at which we view the galaxy.

Our Place in the Universe

Patterns in the Skymotions of Earth

Laws of Motion

Light and Telescopes

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, Earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: The Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

The Expansion of Space

Our Galaxy: The Milky Way

Modern Cosmology and the Origin of Structure

Life in the Universe

Filters

Exam 15: The Realm of the Galaxies

Stars in elliptical galaxies that appear spherical in shape have velocities that:

We know AGN are about the size of our Solar System because of imaging done with the Hubble Space Telescope.

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

Elliptical galaxies appear red because:

By what are the real shapes of galaxies defined?

Quasars were first discovered in which region of the electromagnetic spectrum?

Seyfert galaxies are unique because they have large lobes of radio emission that extend well beyond the visible part of the galaxy.

We classify galaxies by:

Give three examples of types of active galactic nuclei and give one reason why each is unique.

We can determine the 3-dimensional shape of any individual elliptical galaxy by photographing it.

The unified model of AGN suggests that quasars,Seyfert galaxies,and radio galaxies:

The observed redshifts of quasars tell us all of the following EXCEPT:

If a Seyfert galaxy's nucleus varies in brightness on the timescale of 10 hours,then approximately what is the size of the emitting region?

What is the most likely candidate for making up the dark matter in galaxies?

Long-lasting spiral density waves occur in the disk of a spiral galaxy when:

Spiral structure can be triggered in a disk galaxy by:

Which of the following is NOT a difference between spiral and elliptical galaxies?

The Hubble tuning fork diagram (figure below)represents an evolutionary diagram of galaxies from elliptical to spiral.

What do the formation of the Solar System and the existence of AGNs have in common?

The type of AGN we see depends mostly on the angle at which we view the galaxy.

Our Place in the Universe

Patterns in the Skymotions of Earth

Laws of Motion

Light and Telescopes

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, Earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: The Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

The Expansion of Space

Our Galaxy: The Milky Way

Modern Cosmology and the Origin of Structure

Life in the Universe

Filters