Question 1

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

Accepted Answer

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

Question 2

The letters AGN stand for

Accepted Answer

A) three spectral types of stars. 
B) active planet. 
C) active star. 
D) active galaxy nucleus. 
E) None of the other choices are correct. 
A) three spectral types of stars. 
B) active planet. 
C) active star. 
D) active galaxy nucleus. 
E) None of the other choices are correct.

Question 3

What is the Hubble constant essentially a measure of

Accepted Answer

A) the number of galaxies in the universe 
B) the expansion of the universe 
C) the age of the Milky Way galaxy 
D) the amount of dark matter in an average galaxy 
A) the number of galaxies in the universe 
B) the expansion of the universe 
C) the age of the Milky Way galaxy 
D) the amount of dark matter in an average galaxy

Question 4

What is the primary factor in determining the classification for an elliptical galaxy

Accepted Answer

A) size 
B) shape 
C) mass 
D) color 
A) size 
B) shape 
C) mass 
D) color

Question 5

Quasars are most common with redshifts

Accepted Answer

A) less than 0.1 
B) less than 0.5 
C) of about 2 
D) greater than 6 
E) greater than 8 
A) less than 0.1 
B) less than 0.5 
C) of about 2 
D) greater than 6 
E) greater than 8

Question 6

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 7

The spectrum of a(n) ____________________ consists of a continuous spectrum and a few highly redshifted emission lines of due to hydrogen.

Accepted Answer

The answer of The spectrum of a(n) ____________________ consists of...

Question 8

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

Accepted Answer

A) Irregular 
B) S0 
C) E7 
D) Sa 
E) E0 
A) Irregular 
B) S0 
C) E7 
D) Sa 
E) E0

Question 9

The dark lines we see in the following visual wavelength image of a spiral galaxy viewed edge-on is from dust.

Accepted Answer

A) True 
 B)False

Question 10

The diagram illustrates physical size and angular size as seen by the observer. We can estimate the size in light years (or parsecs or km) of M31 from

Accepted Answer

A) its angular size in degrees. 
B) its distance in light years (or parsecs or km). 
C) its angular size in degrees and its distance in light years (or parsecs or km). 
D) It is impossible to estimate the size of M31. 
A) its angular size in degrees. 
B) its distance in light years (or parsecs or km). 
C) its angular size in degrees and its distance in light years (or parsecs or km). 
D) It is impossible to estimate the size of M31.

Question 11

The multiple images forming a ring around the cluster come from two merging distant galaxies.

Accepted Answer

A) True 
 B)False

Question 12

Starburst galaxies

Accepted Answer

A) contain a large number of very young stars, but very little evidence of gas clouds. 
B) contain a large number of very old stars and almost no gas or dust. 
C) are often associated with a galaxy that is colliding with another galaxy. 
D) are common in rich clusters. 
E) are composed of filaments and voids. 
A) contain a large number of very young stars, but very little evidence of gas clouds. 
B) contain a large number of very old stars and almost no gas or dust. 
C) are often associated with a galaxy that is colliding with another galaxy. 
D) are common in rich clusters. 
E) are composed of filaments and voids.

Question 13

Galaxies may contain a supermassive black hole at their center but ___________ an active nucleus because of ____________ into the black hole

Accepted Answer

A) show; mass inflow 
B) not show; mass inflow 
C) show; lack of mass inflow 
A) show; mass inflow 
B) not show; mass inflow 
C) show; lack of mass inflow

Question 14

If a quasar has a recessional velocity of $2.7 × 10^5$ km/s and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone Hint: Note that the units of your result should be (km/s)/Mpc to see what arithmetic process you need to perform.

Accepted Answer

A) 50 km/s/Mpc 
B) $9.7 × 10^8$ (km/s)Mpc 
C) 75 km/s/Mpc 
D) 0.013 km/s/Mpc 
E) 273,600 km/s/Mpc 
A) 50 km/s/Mpc 
B) $9.7 × 10^8$ (km/s)Mpc 
C) 75 km/s/Mpc 
D) 0.013 km/s/Mpc 
E) 273,600 km/s/Mpc

Question 15

_______________ clusters of galaxies contain closely spaced galaxies and often contain giant elliptical galaxies and a hot intergalactic medium.

Accepted Answer

The answer of _______________ clusters of galaxies contain closely spaced...

Question 16

An elliptical galaxy could

Accepted Answer

A) evolve into an irregular galaxy when it has used up all of its gas and dust. 
B) be formed from the collision and merger of spiral galaxies. 
C) evolve from a single spiral galaxy when the spiral has used up all of its gas and dust. 
D) become a starburst galaxy if it were to move through the hot intergalactic medium of a cluster. 
E) evolve from an S0 galaxy if the S0 galaxy were to increase its rotation rate. 
A) evolve into an irregular galaxy when it has used up all of its gas and dust. 
B) be formed from the collision and merger of spiral galaxies. 
C) evolve from a single spiral galaxy when the spiral has used up all of its gas and dust. 
D) become a starburst galaxy if it were to move through the hot intergalactic medium of a cluster. 
E) evolve from an S0 galaxy if the S0 galaxy were to increase its rotation rate.

Question 17

-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 18

What type of galaxies do astronomers believe to be the most common

Accepted Answer

A) elliptical 
B) spiral 
C) irregular 
D) Astronomers have no idea which type of galaxy is most common. 
A) elliptical 
B) spiral 
C) irregular 
D) Astronomers have no idea which type of galaxy is most common.

Question 19

Observations of galaxies and clusters of galaxies indicate that about ___________ percent of the matter in the universe is dark matter.

Accepted Answer

A) 5 
B) 25 
C) 35 
D) 45 
E) 90 
A) 5 
B) 25 
C) 35 
D) 45 
E) 90

Question 20

The units on the Hubble constant are ____________________, as listed in this chapter.

Accepted Answer

The answer of The units on the Hubble constant are...

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

The letters AGN stand for

What is the Hubble constant essentially a measure of

What is the primary factor in determining the classification for an elliptical galaxy

Quasars are most common with redshifts

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

The spectrum of a(n) ____________________ consists of a continuous spectrum and a few highly redshifted emission lines of due to hydrogen.

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

The dark lines we see in the following visual wavelength image of a spiral galaxy viewed edge-on is from dust.

The diagram illustrates physical size and angular size as seen by the observer. We can estimate the size in light years (or parsecs or km) of M31 from

The multiple images forming a ring around the cluster come from two merging distant galaxies.

Starburst galaxies

Galaxies may contain a supermassive black hole at their center but _ an active nucleus because of __ into the black hole

If a quasar has a recessional velocity of $2.7 × 10^5$ km/s and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone Hint: Note that the units of your result should be (km/s)/Mpc to see what arithmetic process you need to perform.

_______________ clusters of galaxies contain closely spaced galaxies and often contain giant elliptical galaxies and a hot intergalactic medium.

An elliptical galaxy could

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

What type of galaxies do astronomers believe to be the most common

Observations of galaxies and clusters of galaxies indicate that about ___________ percent of the matter in the universe is dark matter.

The units on the Hubble constant are ____________________, as listed in this chapter.

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

The Origin of the Solar System

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

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

The letters AGN stand for

What is the Hubble constant essentially a measure of

What is the primary factor in determining the classification for an elliptical galaxy

Quasars are most common with redshifts

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

The spectrum of a(n) ____________________ consists of a continuous spectrum and a few highly redshifted emission lines of due to hydrogen.

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

The dark lines we see in the following visual wavelength image of a spiral galaxy viewed edge-on is from dust.

The diagram illustrates physical size and angular size as seen by the observer. We can estimate the size in light years (or parsecs or km) of M31 from

The multiple images forming a ring around the cluster come from two merging distant galaxies.

Starburst galaxies

Galaxies may contain a supermassive black hole at their center but ___________ an active nucleus because of ____________ into the black hole

If a quasar has a recessional velocity of 2.7×1052.7 × 10^52.7×105 km/s and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone Hint: Note that the units of your result should be (km/s)/Mpc to see what arithmetic process you need to perform.

_______________ clusters of galaxies contain closely spaced galaxies and often contain giant elliptical galaxies and a hot intergalactic medium.

An elliptical galaxy could

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

What type of galaxies do astronomers believe to be the most common

Observations of galaxies and clusters of galaxies indicate that about ___________ percent of the matter in the universe is dark matter.

The units on the Hubble constant are ____________________, as listed in this chapter.

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

The Origin of the Solar System

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

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

Galaxies may contain a supermassive black hole at their center but _ an active nucleus because of __ into the black hole

If a quasar has a recessional velocity of $2.7 × 10^5$ km/s and is determined to be 3600 Mpc, what is the Hubble constant based on this quasar alone Hint: Note that the units of your result should be (km/s)/Mpc to see what arithmetic process you need to perform.