Question 1

What is true of the Local Group?

Accepted Answer

A)   The Andromeda galaxy is a satellite of the Milky Way.
B)   The giant ellipticals are the largest members.
C)   It contains about 2500 galaxies.
D)   The Andromeda galaxy (M31) , and the Milky Way are the two largest galaxies.
E)   It consists of mostly spirals.F) A) and E)
G) None of the above

Question 2

The lobes of radio galaxies are perpendicular to their plane of rotation.

Accepted Answer

A) True 
 B)False

Question 3

Emission nebula, such as M42, are much brighter than planetary nebulae, so are better suited for finding the distances to other galaxies.

Accepted Answer

A) True 
 B)False

Question 4

The Milky Way and M31 in Andromeda both belong to the _.

Accepted Answer

The answer of The Milky Way and M31 in Andromeda...

Question 5

The radio lobes of active galaxies can span of light-years.

Accepted Answer

A)   tens
B)   hundreds
C)   thousands
D)   millions
E)   billionsF) A) and C)
G) A) and E)

Question 6

The closest other galaxy to our solar system is the Sagittarius Dwarf.

Accepted Answer

A) True 
 B)False

Question 7

Some giant elliptical galaxies are found to have disks of gas and dust with star forming regions, and are probably the result of .

Accepted Answer

The answer of Some giant elliptical galaxies are found to...

Question 8

The spectrum of radio galaxies matches radiation, and is produced in strong magnetic fields.

Accepted Answer

The answer of The spectrum of radio galaxies matches radiation,...

Question 9

Hubble divided the spiral galaxies up in what six subtypes?

Accepted Answer

Sa, Sb, Sc...

Question 10

What is true of the lobes of a radio galaxy?

Accepted Answer

A)   They extend out along the galactic plane.
B)   They are hotter than the galactic core.
C)   They form close to the edge of the galaxy.
D)   They radiate primarily in X- rays.
E)   They are perpendicular to the galactic plane.F) A) and B)
G) D) and E)

Question 11

What is meant by a cosmological distance?

Accepted Answer

A distance on the scale of the...

Question 12

In what sense are the quasars "quasi- stellar"?

Accepted Answer

A)   Their energy production is hydrogen- helium fusion, like main- sequence stars.
B)   Their spectra are like those of ordinary stars.
C)   They are upscale versions of O stars, yet hundreds of times more massive.
D)   In short time exposures, their images looked stellar.
E)   Their luminosity comes from the millions of supergiants that compose them.F) A) and D)
G) A) and E)

Question 13

The classical pinwheel- shaped galaxies are , according to Hubble.

Accepted Answer

A)   lenticulars
B)   spirals
C)   ellipticals
D)   irregulars
E)   radio lobesF) A) and B)
G) B) and D)

Question 14

Why can the Tully- Fisher relation be used at greater distances than Cepheids?

Accepted Answer

We must image the individual star and fo...

Question 15

Most radio galaxies belong to Hubble's class _ .

Accepted Answer

The answer of Most radio galaxies belong to Hubble's class...

Question 16

Which property is common to spiral galaxies?

Accepted Answer

A)   globular clusters in the nucleus
B)   ongoing star formation and emission nebula in the arms
C)   open clusters in the halo
D)   very little internal structure
E)   ongoing star formation and emission nebula in the haloF) A) and B)
G) B) and D)

Question 17

What is true of giant and dwarf elliptical galaxies?

Accepted Answer

A)   The dwarfs contain more total mass than the giants.
B)   The giants contain more total mass than the dwarfs.
C)   There are more giants than dwarfs.
D)   The giants are mostly blue, the dwarfs are mostly red.
E)   They contain more dust than spirals.F) A) and E)
G) D) and E)

Question 18

The spiral arms are blue from the presence of Population _ stars in them.

Accepted Answer

The answer of The spiral arms are blue from the...

Question 19

Explain what a standard candle is and how it could be used to determine a galaxy's distance.

Accepted Answer

A standard candle is an object with a we...

Question 20

When mass is accreted into a black hole, what fraction of the total mass- energy can be radiated away?

Accepted Answer

A)   0.007%
B)   0.08%
C)   1.4%
D)   20%
E)   50%F) D) and E)
G) A) and C)

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

Which property is common to spiral galaxies?

Correct AnswerverifiedShow Answer

Emission nebula, such as M42, are much brighter than planetary nebulae, so are better suited for finding the distances to other galaxies.

Correct AnswerverifiedShow Answer

What is true of the Local Group?

Correct AnswerverifiedShow Answer

The Milky Way and M31 in Andromeda both belong to the _.

Correct AnswerverifiedShow Answer

Some giant elliptical galaxies are found to have disks of gas and dust with star forming regions, and are probably the result of .

Correct AnswerverifiedShow Answer

The classical pinwheel- shaped galaxies are , according to Hubble.

Correct AnswerverifiedShow Answer

What is meant by a cosmological distance?

Correct AnswerverifiedA distance on the scale of the...View AnswerShow Answer

Explain what a standard candle is and how it could be used to determine a galaxy's distance.

Correct AnswerverifiedA standard candle is an object with a we...View AnswerShow Answer

What is true of giant and dwarf elliptical galaxies?

Correct AnswerverifiedShow Answer

When mass is accreted into a black hole, what fraction of the total mass- energy can be radiated away?

Correct AnswerverifiedShow Answer

The lobes of radio galaxies are perpendicular to their plane of rotation.

Correct AnswerverifiedShow Answer

In what sense are the quasars "quasi- stellar"?

Correct AnswerverifiedShow Answer

The closest other galaxy to our solar system is the Sagittarius Dwarf.

Correct AnswerverifiedShow Answer

Hubble divided the spiral galaxies up in what six subtypes?

Correct AnswerverifiedSa, Sb, Sc...View AnswerShow Answer

The spectrum of radio galaxies matches radiation, and is produced in strong magnetic fields.

Correct AnswerverifiedShow Answer

Most radio galaxies belong to Hubble's class _ .

Correct AnswerverifiedShow Answer

The spiral arms are blue from the presence of Population _ stars in them.

Correct AnswerverifiedShow Answer

What is true of the lobes of a radio galaxy?

Correct AnswerverifiedShow Answer

Why can the Tully- Fisher relation be used at greater distances than Cepheids?

Correct AnswerverifiedWe must image the individual star and fo...View AnswerShow Answer

The radio lobes of active galaxies can span of light-years.

Correct AnswerverifiedShow Answer

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A distance on the scale of the...
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A standard candle is an object with a we...
View Answer

Correct Answer
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Sa, Sb, Sc...
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We must image the individual star and fo...
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Correct Answer
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