Question 1

If we are directly in the line of a jet coming out of the lobe galaxy's core,we see a:

Accepted Answer

A)   hypernovae.
B)   pulsar.
C)   quasar.
D)   blazar.
E)   magnetar.F) D) and E)
G) None of the above

Question 2

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

Accepted Answer

With 45 members,the Local Group is about...

Question 3

Explain as exactly as possible the way in which the central engine of active galaxies and quasars actually works.Why is the orientation so important?

Accepted Answer

Matter from an accretion disk falls into...

Question 4

Quasar's spectral lines are:

Accepted Answer

A)   emission lines with large redshifts.
B)   a continuum from the synchrotron radiation.
C)   fuzzy absorption lines from the merged light of the billions of stars.
D)   too complex for any interpretation.
E)   nonexistent, the gas so hot as to be totally ionized, so no lines are seen.F) C) and D)
G) A) and E)

Question 5

What type of galaxy are the two Magellanic Clouds? How do we know this visually?

Accepted Answer

Both are irregular galaxies,wi...

Question 6

The Magellanic Clouds are good examples of the ________ type of galaxy.

Accepted Answer

The answer of The Magellanic Clouds are good examples of...

Question 7

Most of the galaxies in the Local Group are:

Accepted Answer

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

Question 8

How does the modern value of Hubble's constant compare to Hubble's original published value?

Accepted Answer

A)   They are very similar.
B)   The modern value is about 7 times lower than the original value.
C)   The modern value is about 7 times higher than the original value.
D)   The modern value is about 700 times lower than the original value.
E)   The modern value is about 700 times higher than the original value.F) A) and E)
G) A) and D)

Question 9

A supernova that occurred 30,000 years ago in a galaxy 100,000 light years away will be observed on Earth:

Accepted Answer

A)   30,000 years from now.
B)   70,000 years ago.
C)   70,000 years from now.
D)   100,000 years ago.
E)   100,000 years from now.F) All of the above
G) C) and D)

Question 10

What lines of evidence show that the Milky Way Galaxy is indeed a spiral galaxy?

Accepted Answer

The plane of the disk is obscured by dus...

Question 11

Type I supernovae can be used to determine distances to galaxies much better than type II supernovae.

Accepted Answer

A) True 
 B)False

Question 12

Quasars usually have their distances measured by what technique?

Accepted Answer

A)   Type II supernovae
B)   Cepheids
C)   Parallax
D)   Hubble's Law
E)   Tully-Fisher relationF) A) and B)
G) A) and C)

Question 13

The huge lobe radio galaxy at the center of the Virgo Supercluster is:

Accepted Answer

A)   Virgo X-1.
B)   M-87, a giant elliptical galaxy.
C)   M-74, a very bright Seyfert Spiral.
D)   M-82, disturbed by the passage of M-81 nearby.
E)   the Large Magellanic Cloud, disturbed by Supernova 1987A.F) None of the above
G) C) and D)

Question 14

The expansion of the universe means that stars in our Milky Way Galaxy are getting increasingly farther apart.

Accepted Answer

A) True 
 B)False

Question 15

Within the boundaries of the constellations Coma and Virgo are found:

Accepted Answer

A)   all the galaxies in the Local Group.
B)   the most distant known quasars.
C)   the largest nearby superclusters of galaxies.
D)   the closest red dwarfs to the Sun.
E)   the Large and Small Magellanic Clouds.F) C) and D)
G) B) and E)

Question 16

Not only does the central engine of active galaxies and quasars require a black hole,but also ________ to provide the radiate energy.

Accepted Answer

A)   globular clusters for food
B)   a very strong magnetic field from neutron stars
C)   a source of high-energy electrons for synchrotron radiation
D)   an accretion disk of infalling matter
E)   a high rate of rotation for the black holeF) A) and B)
G) B) and D)

Question 17

Distinguish an Sa from an Sc galaxy.

Accepted Answer

Sa spirals have more tightly w...

Question 18

How did Hubble use the cosmological redshift to determine distance?

Accepted Answer

The redshift is caused by the Doppler ef...

Question 19

M-87,the giant elliptical at the heart of the Virgo Supercluster,shows a(n)________ extending outward from its core,moving at relativistic velocities.

Accepted Answer

The answer of M-87,the giant elliptical at the heart of...

Question 20

________ galaxies seem to represent a transition between quasars and similar active nuclei compared to more normal spirals.

Accepted Answer

The answer of ________ galaxies seem to represent a transition...

Exam 24: Galaxies: Building Blocks of the Universe

The Magellanic Clouds are good examples of the ________ type of galaxy.

Correct AnswerverifiedShow Answer

Type I supernovae can be used to determine distances to galaxies much better than type II supernovae.

Correct AnswerverifiedShow Answer

The expansion of the universe means that stars in our Milky Way Galaxy are getting increasingly farther apart.

Correct AnswerverifiedShow Answer

Distinguish an Sa from an Sc galaxy.

Correct AnswerverifiedSa spirals have more tightly w...View AnswerShow Answer

How did Hubble use the cosmological redshift to determine distance?

Correct AnswerverifiedThe redshift is caused by the Doppler ef...View AnswerShow Answer

Most of the galaxies in the Local Group are:

Correct AnswerverifiedShow Answer

A supernova that occurred 30,000 years ago in a galaxy 100,000 light years away will be observed on Earth:

Correct AnswerverifiedShow Answer

The huge lobe radio galaxy at the center of the Virgo Supercluster is:

Correct AnswerverifiedShow Answer

What lines of evidence show that the Milky Way Galaxy is indeed a spiral galaxy?

Correct AnswerverifiedThe plane of the disk is obscured by dus...View AnswerShow Answer

________ galaxies seem to represent a transition between quasars and similar active nuclei compared to more normal spirals.

Correct AnswerverifiedShow Answer

If we are directly in the line of a jet coming out of the lobe galaxy's core,we see a:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedWith 45 members,the Local Group is about...View AnswerShow Answer

Quasar's spectral lines are:

Correct AnswerverifiedShow Answer

Explain as exactly as possible the way in which the central engine of active galaxies and quasars actually works.Why is the orientation so important?

Correct AnswerverifiedMatter from an accretion disk falls into...View AnswerShow Answer

What type of galaxy are the two Magellanic Clouds? How do we know this visually?

Correct AnswerverifiedBoth are irregular galaxies,wi...View AnswerShow Answer

Within the boundaries of the constellations Coma and Virgo are found:

Correct AnswerverifiedShow Answer

Not only does the central engine of active galaxies and quasars require a black hole,but also ________ to provide the radiate energy.

Correct AnswerverifiedShow Answer

M-87,the giant elliptical at the heart of the Virgo Supercluster,shows a(n)________ extending outward from its core,moving at relativistic velocities.

Correct AnswerverifiedShow Answer

How does the modern value of Hubble's constant compare to Hubble's original published value?

Correct AnswerverifiedShow Answer

Quasars usually have their distances measured by what technique?

Correct AnswerverifiedShow Answer

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Sa spirals have more tightly w...
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The redshift is caused by the Doppler ef...
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The plane of the disk is obscured by dus...
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With 45 members,the Local Group is about...
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Matter from an accretion disk falls into...
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Both are irregular galaxies,wi...
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