Question 1

How are standard candles used to measure distance?

Accepted Answer

A standard candle is an object...

Question 2

In order to calculate the size and luminosity of a galaxy, you must first determine its ____.

Accepted Answer

A)   age
B)   mass
C)   shape
D)   metallicity
E)   distanceF) A) and B)
G) None of the above E

Question 3

How does the Milky Way compare to other spiral galaxies in size?

Accepted Answer

The Milky Way is a large spira...

Question 4

_______________ galaxies have star formation, but no clear shape.

Accepted Answer

The answer of _______________ galaxies have star formation, but no...

Question 5

NASA's Hubble Deep Field images and GOODS program observations have shown that ____.

Accepted Answer

A)   there are large patchy regions of the sky covered with galaxies separated by empty areas
B)   the entire sky is thickly covered with galaxies
C)   galaxies can be found in all directions, but are relatively rare
D)   galaxies are densely concentrated in a disk structure, which contains the Milky Way
E)   galaxies are concentrated in two opposite directions on the sky, with very few in betweenF) A) and B)
G) B) and C)

Question 6

Because the Hubble constant equals 70 km/s/Mpc, a galaxy with a recession velocity of 4,900 km/s would be a distance of ____ Mpc from Earth.

Accepted Answer

A)   0.014
B)   70
C)   4930
D)   4970
E)   343,000F) All of the above
G) A) and B)

Question 7

The mass of visible matter in a galaxy can be estimated by measuring its luminosity. When this is compared with the measured mass of the galaxy, astronomers find that ____.

Accepted Answer

A)   the measured mass is about ten times the estimated mass, due to the effects of the central black hole
B)   the measured mass is approximately equal to the estimated mass
C)   there is no clear relationship between the estimated and measured mass
D)   the measured mass is about ten times the estimated mass, due to the effects of dark matter
E)   the estimated mass is about ten times the measured mass, due to the effects of dark matterF) A) and E)
G) A) and D)

Question 8

The mass of a galaxy can be determined from its _______________ curve.

Accepted Answer

The answer of The mass of a galaxy can be...

Question 9

What produces the lobes in double-lobed radio galaxies?

Accepted Answer

A)   an accretion disk
B)   a starburst event
C)   black-hole jets
D)   synchrotron radiation
E)   high redshiftsF) B) and E)
G) A) and D)

Question 10

How have elliptical and spiral galaxies developed differently through interactions with other galaxies?

Accepted Answer

Elliptical galaxies are usually found in...

Question 11

A galaxy that has created a large number of young stars all at once is a(n) _______________ galaxy.

Accepted Answer

The answer of A galaxy that has created a large...

Question 12

Globular clusters can be used to estimate the distance to galaxies by measuring the clusters' ____.

Accepted Answer

A)   angular diameter
B)   mass
C)   orbital speed
D)   age
E)   recession velocityF) A) and E)
G) A) and D) A

Question 13

Most supermassive black holes are dormant.

Accepted Answer

A) True 
 B)False

Question 14

The luminosity of a Seyfert galaxy varies with a regular period of months or years.

Accepted Answer

A) True 
 B)False

Question 15

The formation process for supermassive black holes is linked with the formation of galactic ____.

Accepted Answer

A)   disks
B)   clusters
C)   central bulges
D)   coronae
E)   halosF) A) and B)
G) A) and E) C

Question 16

Gas falling into a black hole becomes ____.

Accepted Answer

A)   hot, due to an increase in speed and molecular collisions
B)   hot, due to radiation from the black hole
C)   compacted into solid matter by tidal forces.
D)   cool, due tothe loss of gravitational energy.
E)   cool, due tothe emission of infrared photonsF) A) and D)
G) A) and C)

Question 17

A spiral galaxy with an extremely luminous, active core is called a(n) _______________ galaxy.

Accepted Answer

The answer of A spiral galaxy with an extremely luminous,...

Question 18

All elliptical galaxies are more massive than the largest spiral galaxies.

Accepted Answer

A) True 
 B)False

Question 19

Active galactic nuclei were first found through observations in the ____ wavelength band.

Accepted Answer

A)   visible
B)   infrared
C)   X-ray
D)   radio
E)   ultravioletF) B) and D)
G) A) and E)

Question 20

Cepheid variables are useful in measuring the distance to ____.

Accepted Answer

A)   globular clusters and dwarf galaxies around the Milky way, but nothing farther
B)   globular clusters and the Andromeda Galaxy, but not more distant objects
C)   galaxies that are within 30 megaparsecs, a relatively short distance
D)   galaxies that are moderately far away, up to about 500 megaparsecs
E)   galaxies and galactic clusters within a gigaparsec of the Milky WayF) C) and D)
G) A) and D)

Exam 16: Galaxies

How are standard candles used to measure distance?

Correct AnswerverifiedA standard candle is an object...View AnswerShow Answer

In order to calculate the size and luminosity of a galaxy, you must first determine its ____.

Correct AnswerverifiedE

How does the Milky Way compare to other spiral galaxies in size?

Correct AnswerverifiedThe Milky Way is a large spira...View AnswerShow Answer

_______________ galaxies have star formation, but no clear shape.

Correct AnswerverifiedShow Answer

NASA's Hubble Deep Field images and GOODS program observations have shown that ____.

Correct AnswerverifiedShow Answer

Because the Hubble constant equals 70 km/s/Mpc, a galaxy with a recession velocity of 4,900 km/s would be a distance of ____ Mpc from Earth.

Correct AnswerverifiedShow Answer

The mass of visible matter in a galaxy can be estimated by measuring its luminosity. When this is compared with the measured mass of the galaxy, astronomers find that ____.

Correct AnswerverifiedShow Answer

The mass of a galaxy can be determined from its _______________ curve.

Correct AnswerverifiedShow Answer

What produces the lobes in double-lobed radio galaxies?

Correct AnswerverifiedShow Answer

How have elliptical and spiral galaxies developed differently through interactions with other galaxies?

Correct AnswerverifiedElliptical galaxies are usually found in...View AnswerShow Answer

A galaxy that has created a large number of young stars all at once is a(n) _______________ galaxy.

Correct AnswerverifiedShow Answer

Globular clusters can be used to estimate the distance to galaxies by measuring the clusters' ____.

Correct AnswerverifiedA

Most supermassive black holes are dormant.

Correct AnswerverifiedShow Answer

The luminosity of a Seyfert galaxy varies with a regular period of months or years.

Correct AnswerverifiedShow Answer

The formation process for supermassive black holes is linked with the formation of galactic ____.

Correct AnswerverifiedC

Gas falling into a black hole becomes ____.

Correct AnswerverifiedShow Answer

A spiral galaxy with an extremely luminous, active core is called a(n) _______________ galaxy.

Correct AnswerverifiedShow Answer

All elliptical galaxies are more massive than the largest spiral galaxies.

Correct AnswerverifiedShow Answer

Active galactic nuclei were first found through observations in the ____ wavelength band.

Correct AnswerverifiedShow Answer

Cepheid variables are useful in measuring the distance to ____.

Correct AnswerverifiedShow Answer

Correct Answer
verified
A standard candle is an object...
View Answer

Correct Answer
verified
E

Correct Answer
verified
The Milky Way is a large spira...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Elliptical galaxies are usually found in...
View Answer

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified