Question 1

Which of the following is NOT one of Hubble's types of galaxies?

Accepted Answer

A)  normal spirals 
B)  barrel spirals 
C)  Seyfert spirals 
D)  irregular type II 
E)  dwarf ellipticals 
A)  normal spirals 
B)  barrel spirals 
C)  Seyfert spirals 
D)  irregular type II 
E)  dwarf ellipticals

Question 2

A spherical galaxy,like M87,which looks like a monster globular cluster,is type:

Accepted Answer

A)  S0. 
B)  ES. 
C)  E0. 
D)  ES1. 
E)  0V. 
A)  S0. 
B)  ES. 
C)  E0. 
D)  ES1. 
E)  0V.

Question 3

What are the common properties shared by most active galaxies and quasars? How do these properties lead to an understanding of the central engine?

Accepted Answer

All active galaxies and quasars emit mas

Question 4

When mass is accreted into a black hole,how much total mass-energy can be radiated away?

Accepted Answer

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

Question 5

How can the size of a quasar be measured?

Accepted Answer

The size of a quasar

Question 6

Which of these would be made up of only Population II stars?

Accepted Answer

A)  elliptical galaxies 
B)  Irr type I 
C)  Irr type II 
D)  barred spirals 
E)  Seyfert spirals 
A)  elliptical galaxies 
B)  Irr type I 
C)  Irr type II 
D)  barred spirals 
E)  Seyfert spirals

Question 7

What is true of the lobes of a radio galaxy?

Accepted Answer

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

Question 8

According to the Hubble Law,a galaxy with a velocity of 25,000 km/s will be:

Accepted Answer

A)  100 million pcs away. 
B)  400 million pcs away. 
C)  700 million pcs away. 
D)  1000 million pcs away. 
E)  less than 1 million pcs away. 
A)  100 million pcs away. 
B)  400 million pcs away. 
C)  700 million pcs away. 
D)  1000 million pcs away. 
E)  less than 1 million pcs away.

Question 9

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.

Question 10

The quasars with the largest presently known redshifts are close to:

Accepted Answer

A)  0.96. 
B)  3. 
C)  8. 
D)  20. 
E)  65. 
A)  0.96. 
B)  3. 
C)  8. 
D)  20. 
E)  65.

Question 11

Irregular galaxies,although small,have large H II regions and much on-going star formation for their size.

Accepted Answer

A) True 
 B)False

Question 12

The magnetic fields carried by jets coming from active galactic nuclei are generated by:

Accepted Answer

A)  the combined magnetic fields of the many stars near the galaxy's center. 
B)  the central black hole. 
C)  the movement of the interstellar matter of the galaxy. 
D)  the movement of the stars in the galaxy. 
E)  charged matter in the accretion disk of the central black hole. 
A)  the combined magnetic fields of the many stars near the galaxy's center. 
B)  the central black hole. 
C)  the movement of the interstellar matter of the galaxy. 
D)  the movement of the stars in the galaxy. 
E)  charged matter in the accretion disk of the central black hole.

Question 13

The flattest of the ellipticals 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 14

The energy radiated by a typical quasar requires that its black hole accrete about:

Accepted Answer

A)  one solar mass a century. 
B)  one solar mass a decade. 
C)  one solar mass a year. 
D)  ten solar masses a year. 
E)  one solar mass a day. 
A)  one solar mass a century. 
B)  one solar mass a decade. 
C)  one solar mass a year. 
D)  ten solar masses a year. 
E)  one solar mass a day.

Question 15

The type of radiation coming from active nuclei due to electrons spiraling in very strong magnetic fields at relativistic speeds is:

Accepted Answer

A)  positron radiation. 
B)  thermal energy. 
C)  a blackbody curve. 
D)  synchrotron radiation. 
E)  nuclear energy. 
A)  positron radiation. 
B)  thermal energy. 
C)  a blackbody curve. 
D)  synchrotron radiation. 
E)  nuclear energy.

Question 16

Astronomers observe unobscured X-rays generated in active galactic nuclei.

Accepted Answer

A) True 
 B)False

Question 17

The elliptical galaxies are most like what part of our Milky Way? Explain.

Accepted Answer

They are "all halo",with only

Question 18

The look-back time of an object is directly related to its:

Accepted Answer

A)  mass. 
B)  distance. 
C)  luminosity. 
D)  size. 
E)  composition. 
A)  mass. 
B)  distance. 
C)  luminosity. 
D)  size. 
E)  composition.

Question 19

Almost all active galactic nuclei seem to be involved in ________ with neighbors.

Accepted Answer

The answer of Almost all active galactic nuclei seem to...

Question 20

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.

Exam 24: Galaxies: Building Blocks of the Universe

Which of the following is NOT one of Hubble's types of galaxies?

A spherical galaxy,like M87,which looks like a monster globular cluster,is type:

What are the common properties shared by most active galaxies and quasars? How do these properties lead to an understanding of the central engine?

When mass is accreted into a black hole,how much total mass-energy can be radiated away?

How can the size of a quasar be measured?

Which of these would be made up of only Population II stars?

What is true of the lobes of a radio galaxy?

According to the Hubble Law,a galaxy with a velocity of 25,000 km/s will be:

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

The quasars with the largest presently known redshifts are close to:

Irregular galaxies,although small,have large H II regions and much on-going star formation for their size.

The magnetic fields carried by jets coming from active galactic nuclei are generated by:

The flattest of the ellipticals are class:

The energy radiated by a typical quasar requires that its black hole accrete about:

The type of radiation coming from active nuclei due to electrons spiraling in very strong magnetic fields at relativistic speeds is:

Astronomers observe unobscured X-rays generated in active galactic nuclei.

The elliptical galaxies are most like what part of our Milky Way? Explain.

The look-back time of an object is directly related to its:

Almost all active galactic nuclei seem to be involved in ________ with neighbors.

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

Charting the Heavens: The Foundations of Astronomy

The Copernican Revolution: The Birth of Modern Science

Radiation: Information from the Cosmos

Spectroscopy: The Inner Workings of Atoms

Telescopes: The Tools of Astronomy

The Solar System: Comparative Planetology and Formation Models

Earth: Our Home in Space

The Moon and Mercury: Scorched and Battered Worlds

Venus: Earth's Sister Planet

Mars: A Near Miss for Life?

Jupiter: Giant of the Solar System

Saturn: Spectacular Rings and Mysterious Moons

Uranus and Neptune: The Outer Worlds of the Solar System

Solar System Debris: Keys to Our Origin

Exoplanets: Planetary Systems Beyond Our Own

The Sun: Our Parent Star

The Stars: Giants,Dwarfs,and the Main Sequence

The Interstellar Medium: Gas and Dust among the Stars

Star Formation: A Traumatic Birth

Stellar Evolution: The Life and Death of a Star

Stellar Explosions: Novae,Supernovae,and the Formation of the Elements

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: A Spiral in Space

Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

Cosmology: The Big Bang and the Fate of the Universe

The Early Universe: Toward the Beginning of Time

Life in the Universe: Are We Alone?

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