Question 1

Dark matter consists of material that emits radiation at wavelengths other than visible light.

Accepted Answer

A) True 
 B)False

Question 2

The 3-dimensional shape of an elliptical galaxy depends on the average velocity of its stars along each of the three axes.

Accepted Answer

A) True 
 B)False

Question 3

Although elliptical and irregular galaxies have been observed in both dwarf and giant varieties,we find only giant spiral galaxies.

Accepted Answer

A) True 
 B)False

Question 4

Any asymmetry in the gravity field of a spiral galaxy can induce spiral structure.

Accepted Answer

A) True 
 B)False

Question 5

The dark matter in galaxies is __________ the luminous material.

Accepted Answer

A)  distributed in roughly the same way as 
B)  much more extended in radius than 
C)  much more centrally concentrated than 
D)  much less uniform in density than 
A)  distributed in roughly the same way as 
B)  much more extended in radius than 
C)  much more centrally concentrated than 
D)  much less uniform in density than

Question 6

What is a rotation curve,and what can it tell us about a galaxy?

Accepted Answer

A rotation curve is a plot of the veloci

Question 7

What do the broad emission lines in quasar spectra tell astronomers about these objects?

Accepted Answer

A)  They are very far away. 
B)  They are moving away from us. 
C)  They have rapid internal motions. 
D)  They are very dense. 
A)  They are very far away. 
B)  They are moving away from us. 
C)  They have rapid internal motions. 
D)  They are very dense.

Question 8

Today only 30 percent of galaxies contain active galactic nuclei.

Accepted Answer

A) True 
 B)False

Question 9

Which of the given rotation curves in the figure below represents what astronomers would expect if dark matter did not exist in the halo of a spiral galaxy?

Accepted Answer

A)  Rotation curve A 
B)  Rotation curve B 
C)  Rotation curve C 
D)  None of the curves would be correct. 
A)  Rotation curve A 
B)  Rotation curve B 
C)  Rotation curve C 
D)  None of the curves would be correct.

Question 10

AGNs appear to be powered by:

Accepted Answer

A)  supermassive black holes 
B)  extremely dense star clusters 
C)  ultradense molecular clouds. 
D)  dark matter 
A)  supermassive black holes 
B)  extremely dense star clusters 
C)  ultradense molecular clouds. 
D)  dark matter

Question 11

Once we get outside the dark matter halo of a galaxy,how should the speed of an orbiting body such as a satellite dwarf galaxy depend on its distance from the giant galaxy's center?

Accepted Answer

When you are outside the giant galaxy's

Dark matter consists of material that emits radiation at wavelengths other than visible light.

The 3-dimensional shape of an elliptical galaxy depends on the average velocity of its stars along each of the three axes.

Although elliptical and irregular galaxies have been observed in both dwarf and giant varieties,we find only giant spiral galaxies.

Any asymmetry in the gravity field of a spiral galaxy can induce spiral structure.

The dark matter in galaxies is __________ the luminous material.

What is a rotation curve,and what can it tell us about a galaxy?

What do the broad emission lines in quasar spectra tell astronomers about these objects?

Today only 30 percent of galaxies contain active galactic nuclei.

Which of the given rotation curves in the figure below represents what astronomers would expect if dark matter did not exist in the halo of a spiral galaxy?

AGNs appear to be powered by:

Once we get outside the dark matter halo of a galaxy,how should the speed of an orbiting body such as a satellite dwarf galaxy depend on its distance from the giant galaxy's center?

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

Dark matter consists of material that emits radiation at wavelengths other than visible light.

The 3-dimensional shape of an elliptical galaxy depends on the average velocity of its stars along each of the three axes.

Although elliptical and irregular galaxies have been observed in both dwarf and giant varieties,we find only giant spiral galaxies.

Any asymmetry in the gravity field of a spiral galaxy can induce spiral structure.

The dark matter in galaxies is __________ the luminous material.

What is a rotation curve,and what can it tell us about a galaxy?

What do the broad emission lines in quasar spectra tell astronomers about these objects?

Today only 30 percent of galaxies contain active galactic nuclei.

Which of the given rotation curves in the figure below represents what astronomers would expect if dark matter did not exist in the halo of a spiral galaxy?

AGNs appear to be powered by:

Once we get outside the dark matter halo of a galaxy,how should the speed of an orbiting body such as a satellite dwarf galaxy depend on its distance from the giant galaxy's center?

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