Question 1

Although theory says a massive black hole with an accretion disk should be emitting X-rays, many black holes emit

Accepted Answer

A)  mostly in the infrared. 
B)  only in the visible. 
C)  mainly in the gamma. 
D)  virtually no radiation at all. 
E)  equally across the entire electromagnetic spectrum. 
A)  mostly in the infrared. 
B)  only in the visible. 
C)  mainly in the gamma. 
D)  virtually no radiation at all. 
E)  equally across the entire electromagnetic spectrum. A

Question 2

Collisions between galaxies have little effect on the individual stars.

Accepted Answer

A) True 
 B)False  True

Question 3

Why is Hubble's Law called the top of the distance ladder?

Accepted Answer

Hubble's Law builds on the other distance measurement techniques, which are rungs on the distance ladder. Hubble's Law works at the very largest distances, making it the top of the ladder.

Question 4

The smallest dwarf irregular galaxies are no richer in stars than the largest known globular clusters.

Accepted Answer

A) True 
 B)False

Question 5

A galaxy that was once a quasar is likely to

Accepted Answer

A)  have burned all its fuel by now and be dark. 
B)  now be a dwarf irregular. 
C)  have a black hole at its nucleus. 
D)  still be a quasar. 
E)  be less than 5 billion years old. 
A)  have burned all its fuel by now and be dark. 
B)  now be a dwarf irregular. 
C)  have a black hole at its nucleus. 
D)  still be a quasar. 
E)  be less than 5 billion years old.

Question 6

Rotation curves for spiral galaxies show

Accepted Answer

A)  they are slowing down. 
B)  rotation speed drops off further from the nucleus. 
C)  most have dark halos. 
D)  most of the mass lies in the nucleus. 
E)  no relation to mass. 
A)  they are slowing down. 
B)  rotation speed drops off further from the nucleus. 
C)  most have dark halos. 
D)  most of the mass lies in the nucleus. 
E)  no relation to mass.

Question 7

The flattest of the elliptical galaxies are class

Accepted Answer

A)  E0. 
B)  SBO. 
C)  E7. 
D)  E9. 
E)  SBF. 
A)  E0. 
B)  SBO. 
C)  E7. 
D)  E9. 
E)  SBF.

Question 8

What are the Magellanic Clouds? What happened in the LMC in 1987?

Accepted Answer

The Magellanic Clouds are our companion

Question 9

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

Question 10

Quasar's spectral lines are

Accepted Answer

A)  emission lines with large red shifts. 
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. 
A)  emission lines with large red shifts. 
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.

Question 11

The Milky Way is often considered to be an intermediately wound, barred spiral, which would be type

Accepted Answer

A)  E4. 
B)  Sa. 
C)  SBb. 
D)  SBV. 
E)  B2S. 
A)  E4. 
B)  Sa. 
C)  SBb. 
D)  SBV. 
E)  B2S.

Question 12

Distinguish an Sa from an Sc galaxy.

Accepted Answer

Sa spirals have more tightly w

Question 13

Which type of galaxy has a small bulge and loose, widely spread, poorly defined spiral pattern?

Accepted Answer

A)  SO 
B)  S9 
C)  Sa 
D)  Sc 
E)  SBw 
A)  SO 
B)  S9 
C)  Sa 
D)  Sc 
E)  SBw

Question 14

How can some mergers activate spirals, and others destroy them?

Accepted Answer

A merger between equally massive galaxie

Question 15

In color photos, spirals typically have ________ arms with pink H II regions.

Accepted Answer

The answer of In color photos, spirals typically have ________...

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

Why is light variability a critical issue with the sizes of active nuclei?

Accepted Answer

The source of the light cannot be any la

Question 18

Quasar is short for what? Is this true of all of them?

Accepted Answer

Quasi-stellar radio

Question 19

In this diagram, the galaxy at the left side is a(n)

Accepted Answer

A)  Seyfert. 
B)  Spiral. 
C)  Barred spiral. 
D)  Elliptical. 
E)  Irregular. 
A)  Seyfert. 
B)  Spiral. 
C)  Barred spiral. 
D)  Elliptical. 
E)  Irregular.

Question 20

Most galaxies are members of some sort of cluster of galaxies.

Accepted Answer

A) True 
 B)False

Although theory says a massive black hole with an accretion disk should be emitting X-rays, many black holes emit

Collisions between galaxies have little effect on the individual stars.

Why is Hubble's Law called the top of the distance ladder?

The smallest dwarf irregular galaxies are no richer in stars than the largest known globular clusters.

A galaxy that was once a quasar is likely to

Rotation curves for spiral galaxies show

The flattest of the elliptical galaxies are class

What are the Magellanic Clouds? What happened in the LMC in 1987?

Quasars usually have their distances measured by what technique?

Quasar's spectral lines are

The Milky Way is often considered to be an intermediately wound, barred spiral, which would be type

Distinguish an Sa from an Sc galaxy.

Which type of galaxy has a small bulge and loose, widely spread, poorly defined spiral pattern?

How can some mergers activate spirals, and others destroy them?

In color photos, spirals typically have ________ arms with pink H II regions.

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

Why is light variability a critical issue with the sizes of active nuclei?

Quasar is short for what? Is this true of all of them?

In this diagram, the galaxy at the left side is a(n)

Most galaxies are members of some sort of cluster of galaxies.

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The Solar System

Earth and Its Moon

The Eight Planets

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Formation of Planetary Systems

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Exam 14: Galaxies

Although theory says a massive black hole with an accretion disk should be emitting X-rays, many black holes emit

Collisions between galaxies have little effect on the individual stars.

Why is Hubble's Law called the top of the distance ladder?

The smallest dwarf irregular galaxies are no richer in stars than the largest known globular clusters.

A galaxy that was once a quasar is likely to

Rotation curves for spiral galaxies show

The flattest of the elliptical galaxies are class

What are the Magellanic Clouds? What happened in the LMC in 1987?

Quasars usually have their distances measured by what technique?

Quasar's spectral lines are

The Milky Way is often considered to be an intermediately wound, barred spiral, which would be type

Distinguish an Sa from an Sc galaxy.

Which type of galaxy has a small bulge and loose, widely spread, poorly defined spiral pattern?

How can some mergers activate spirals, and others destroy them?

In color photos, spirals typically have ________ arms with pink H II regions.

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

Why is light variability a critical issue with the sizes of active nuclei?

Quasar is short for what? Is this true of all of them?

In this diagram, the galaxy at the left side is a(n)

Most galaxies are members of some sort of cluster of galaxies.

The Night Sky

Light and Telescopes

The Solar System

Earth and Its Moon

The Eight Planets

Small Bodies in the Solar System

Formation of Planetary Systems

The Sun

Measuring the Stars

Star Formation and Evolution

Stellar Explosions

Black Holes

The Milky Way Galaxy

Cosmology and the Universe

Filters