Question 1

The most luminous objects known in the universe are

Accepted Answer

A)   Seyferts.
B)   radio lobe galaxies.
C)   blazars.
D)   giant ellipticals.
E)   quasars.F) A) and E)
G) B) and D)

Question 2

The black hole in the core of a Seyfert galaxy consumes the equivalent of hundreds of solar masses a day.

Accepted Answer

A) True 
 B)False

Question 3

The supermassive black holes that may be powering active galaxies emit only synchrotron radiation.

Accepted Answer

A) True 
 B)False

Question 4

The largest nearby cluster of galaxies lies about 17 Mpc distant in

Accepted Answer

A)   Ursa Major.
B)   Coma Bernices.
C)   Virgo.
D)   Sculptor.
E)   Sagittarius.F) A) and B)
G) A) and C)

Question 5

Fast- moving electrons, moving close to c, in a strong magnetic field generate radiation.

Accepted Answer

The answer of Fast- moving electrons, moving close to c,...

Question 6

The flattest of all the ellipticals are class .

Accepted Answer

The answer of The flattest of all the ellipticals are...

Question 7

The combined of the Local Group binds them together.

Accepted Answer

The answer of The combined of the Local Group binds...

Question 8

What is the nearest huge cluster of thousands of galaxies, to which the Local Group may belong?

Accepted Answer

A)   The Great Wall
B)   Sagittarius Cluster
C)   Virgo Cluster
D)   Coma Cluster
E)   Corona Borealis ClusterF) A) and E)
G) A) and D)

Question 9

The optical classification of galaxies was pioneered in the 1930s by .

Accepted Answer

The answer of The optical classification of galaxies was pioneered...

Question 10

Elliptical galaxies contain only Population _ stars and little gas and dust.

Accepted Answer

The answer of Elliptical galaxies contain only Population _ stars...

Question 11

Why do quasars die out over time?

Accepted Answer

The black hole at their center...

Question 12

Most of the galaxies in the Local Group are

Accepted Answer

A)   small irregulars like the Magellanic Clouds.
B)   active galaxies like Centaurus A.
C)   small spirals like M33 and the LMC.
D)   small ellipticals like the companions to M31 in Andromeda.
E)   big spirals like our Galaxy and M31.F) A) and D)
G) All of the above

Question 13

Relate Seyferts to spirals.

Accepted Answer

Both have spiral arms, but the nucleus o...

Question 14

Discuss the population, size, and types of galaxies we find in our Local Group.

Accepted Answer

With 55 members, the Local Group is abou...

Question 15

In the Hubble Classification scheme, the three main types of galaxies are , , and .

Accepted Answer

A)   spirals; Seyferts; irregulars
B)   spirals; ellipticals; Seyferts
C)   radio lobe; ellipticals; spirals
D)   Seyferts; ellipticals; irregulars
E)   spirals; ellipticals; irregularsF) A) and B)
G) A) and C)

Question 16

Why do some radio galaxies appear to have lobes while some do not?

Accepted Answer

It's believed that all radio g...

Question 17

In the Local Group, most members are either dwarf ellipticals or spirals.

Accepted Answer

A) True 
 B)False

Question 18

Active galaxies emit most of their radiation as visible light.

Accepted Answer

A) True 
 B)False

Question 19

Why do rich clusters of galaxies contain a larger fraction of ellipticals than normal?

Accepted Answer

In the densest clusters, colli...

Question 20

A galaxy with a blueshift is moving Earth.

Accepted Answer

The answer of A galaxy with a blueshift is moving...

Exam 16: Normal and Active Galaxies: Building Blocks of the Universe

The largest nearby cluster of galaxies lies about 17 Mpc distant in

Correct AnswerverifiedShow Answer

Fast- moving electrons, moving close to c, in a strong magnetic field generate radiation.

Correct AnswerverifiedShow Answer

The black hole in the core of a Seyfert galaxy consumes the equivalent of hundreds of solar masses a day.

Correct AnswerverifiedShow Answer

Discuss the population, size, and types of galaxies we find in our Local Group.

Correct AnswerverifiedWith 55 members, the Local Group is abou...View AnswerShow Answer

Why do quasars die out over time?

Correct AnswerverifiedThe black hole at their center...View AnswerShow Answer

In the Hubble Classification scheme, the three main types of galaxies are , , and .

Correct AnswerverifiedShow Answer

What is the nearest huge cluster of thousands of galaxies, to which the Local Group may belong?

Correct AnswerverifiedShow Answer

Why do some radio galaxies appear to have lobes while some do not?

Correct AnswerverifiedIt's believed that all radio g...View AnswerShow Answer

Elliptical galaxies contain only Population _ stars and little gas and dust.

Correct AnswerverifiedShow Answer

Most of the galaxies in the Local Group are

Correct AnswerverifiedShow Answer

The flattest of all the ellipticals are class .

Correct AnswerverifiedShow Answer

In the Local Group, most members are either dwarf ellipticals or spirals.

Correct AnswerverifiedShow Answer

The optical classification of galaxies was pioneered in the 1930s by .

Correct AnswerverifiedShow Answer

Relate Seyferts to spirals.

Correct AnswerverifiedBoth have spiral arms, but the nucleus o...View AnswerShow Answer

Active galaxies emit most of their radiation as visible light.

Correct AnswerverifiedShow Answer

A galaxy with a blueshift is moving Earth.

Correct AnswerverifiedShow Answer

Why do rich clusters of galaxies contain a larger fraction of ellipticals than normal?

Correct AnswerverifiedIn the densest clusters, colli...View AnswerShow Answer

The supermassive black holes that may be powering active galaxies emit only synchrotron radiation.

Correct AnswerverifiedShow Answer

The combined of the Local Group binds them together.

Correct AnswerverifiedShow Answer

The most luminous objects known in the universe are

Correct AnswerverifiedShow Answer

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With 55 members, the Local Group is abou...
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The black hole at their center...
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It's believed that all radio g...
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Both have spiral arms, but the nucleus o...
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In the densest clusters, colli...
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