Question 1

To what three types of modern survivors can the masses of the protogalactic blobs be compared?

Accepted Answer

Globular clusters,dwarf irregu

Question 2

The last quasar probably died out a billion years ago,for none lie within a billion light years of us.

Accepted Answer

A) True 
 B)False

Question 3

When two galaxies move very closely to each other,their ________ may dramatically rearrange their visible structures.

Accepted Answer

gravitatio

Question 4

Careful observations of nearby normal and active galaxies reveal that the ass of the central black hole is well correlated with the mass of the galactic bulge.The ratio of bulge mass to black hole mass is roughly:

Accepted Answer

A)  1 to 2000. 
B)  1 to 200. 
C)  1 to 20. 
D)  20 to 1. 
E)  200 to 1. 
A)  1 to 2000. 
B)  1 to 200. 
C)  1 to 20. 
D)  20 to 1. 
E)  200 to 1.

Question 5

Why did the quasar epoch end?

Accepted Answer

Mergers declined and

Question 6

Collisions between galaxies:

Accepted Answer

A)  are much rarer than collisions between stars. 
B)  can turn elliptical galaxies into spirals. 
C)  cause large numbers of stars to collide and explode. 
D)  cause the gas and dust clouds to collide, leading to rapid star formation. 
E)  are the best explanation for gamma-ray burst events. 
A)  are much rarer than collisions between stars. 
B)  can turn elliptical galaxies into spirals. 
C)  cause large numbers of stars to collide and explode. 
D)  cause the gas and dust clouds to collide, leading to rapid star formation. 
E)  are the best explanation for gamma-ray burst events.

Question 7

Describe how the radio lobes get to the outside of their galaxy.Where do they come from? How is it that they still exist this far away from their origin? Estimate how much time it might take these lobes to travel to their current locations.

Accepted Answer

Active galaxies sometimes eject jets of

Question 8

An interaction between a large and a small elliptical galaxy that results in a large spiral and a small elliptical galaxy takes:

Accepted Answer

A)  several thousand years. 
B)  several hundred thousand years. 
C)  several million years. 
D)  several hundred million years. 
E)  several billion years. 
A)  several thousand years. 
B)  several hundred thousand years. 
C)  several million years. 
D)  several hundred million years. 
E)  several billion years.

Question 9

The lensing of a distant quasar is produced by ________ of a foreground galaxy.

Accepted Answer

A)  all the normal matter and dark matter 
B)  only the mass of the black hole in the nucleus 
C)  an individual star 
D)  a pulsar's intense magnetic field 
E)  a relativistic jet 
A)  all the normal matter and dark matter 
B)  only the mass of the black hole in the nucleus 
C)  an individual star 
D)  a pulsar's intense magnetic field 
E)  a relativistic jet

Question 10

According to their rotation curves,most spiral galaxies:

Accepted Answer

A)  rotate as a solid body. 
B)  rotate counterclockwise. 
C)  have decreasing rotational speeds with increasing distance. 
D)  contain dark matter. 
E)  contain dark energy. 
A)  rotate as a solid body. 
B)  rotate counterclockwise. 
C)  have decreasing rotational speeds with increasing distance. 
D)  contain dark matter. 
E)  contain dark energy.

Question 11

A billion solar mass black hole has a radius of only:

Accepted Answer

A)  one solar diameter. 
B)  20 A.U. 
C)  400 A.U. 
D)  3 parsecs. 
E)  20 parsecs. 
A)  one solar diameter. 
B)  20 A.U. 
C)  400 A.U. 
D)  3 parsecs. 
E)  20 parsecs.

Question 12

Contrast the results of a collision between two spiral galaxies on their stars and their gas and dust clouds.

Accepted Answer

The stars are so spread out that collisi

Question 13

Data on binary galaxies is analyzed to determine their average masses under the assumption that they,like binary stars,have ________ orbits.

Accepted Answer

The answer of Data on binary galaxies is analyzed to...

Question 14

Which of these is NOT considered a fine example of galactic collisions?

Accepted Answer

A)  the Cartwheel Galaxy 
B)  the Antennae Galaxies 
C)  the Whirlpool Galaxy 
D)  M-31 in Andromeda 
E)  M-87 in Virgo 
A)  the Cartwheel Galaxy 
B)  the Antennae Galaxies 
C)  the Whirlpool Galaxy 
D)  M-31 in Andromeda 
E)  M-87 in Virgo

Question 15

Redshift surveys give us:

Accepted Answer

A)  an idea of how turbulent the intergalactic gas is. 
B)  a 3-D layout of galaxies in space. 
C)  the total mass of the universe. 
D)  a more accurate census of the Local Group. 
E)  a better value of the speed of light. 
A)  an idea of how turbulent the intergalactic gas is. 
B)  a 3-D layout of galaxies in space. 
C)  the total mass of the universe. 
D)  a more accurate census of the Local Group. 
E)  a better value of the speed of light.

Question 16

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 17

The younger the universe was,the more abundant quasars were,according to our deep surveys.

Accepted Answer

A) True 
 B)False

Question 18

How do head-tail radio galaxies reveal their motion?

Accepted Answer

Their bi-polar jets shock the

Question 19

Collisions between galaxies are thought to:

Accepted Answer

A)  have stopped about 5 billion years ago. 
B)  be commonplace. 
C)  have never occurred. 
D)  be extremely rare. 
E)  have only occurred between 10 and 15 billion years ago. 
A)  have stopped about 5 billion years ago. 
B)  be commonplace. 
C)  have never occurred. 
D)  be extremely rare. 
E)  have only occurred between 10 and 15 billion years ago.

Question 20

Star streams that are seen around the Milky Way Galaxy are probably the result of:

Accepted Answer

A)  stars ejected from the Galaxy by gravitational encounters with the central black hole. 
B)  tidal interactions with satellite galaxies. 
C)  a collision with a large galaxy in the distant past. 
D)  stars being pulled from the Andromeda Galaxy. 
E)  spiral density waves. 
A)  stars ejected from the Galaxy by gravitational encounters with the central black hole. 
B)  tidal interactions with satellite galaxies. 
C)  a collision with a large galaxy in the distant past. 
D)  stars being pulled from the Andromeda Galaxy. 
E)  spiral density waves.

Exam 25: Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

To what three types of modern survivors can the masses of the protogalactic blobs be compared?

The last quasar probably died out a billion years ago,for none lie within a billion light years of us.

When two galaxies move very closely to each other,their ________ may dramatically rearrange their visible structures.

Careful observations of nearby normal and active galaxies reveal that the ass of the central black hole is well correlated with the mass of the galactic bulge.The ratio of bulge mass to black hole mass is roughly:

Why did the quasar epoch end?

Collisions between galaxies:

Describe how the radio lobes get to the outside of their galaxy.Where do they come from? How is it that they still exist this far away from their origin? Estimate how much time it might take these lobes to travel to their current locations.

An interaction between a large and a small elliptical galaxy that results in a large spiral and a small elliptical galaxy takes:

The lensing of a distant quasar is produced by ________ of a foreground galaxy.

According to their rotation curves,most spiral galaxies:

A billion solar mass black hole has a radius of only:

Contrast the results of a collision between two spiral galaxies on their stars and their gas and dust clouds.

Data on binary galaxies is analyzed to determine their average masses under the assumption that they,like binary stars,have ________ orbits.

Which of these is NOT considered a fine example of galactic collisions?

Redshift surveys give us:

A galaxy that was once a quasar is likely to:

The younger the universe was,the more abundant quasars were,according to our deep surveys.

How do head-tail radio galaxies reveal their motion?

Collisions between galaxies are thought to:

Star streams that are seen around the Milky Way Galaxy are probably the result of:

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: Building Blocks of the Universe

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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