Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

Why are supermassive galaxies often found at the cores of rich galaxy clusters?

Accepted Answer

A) Most of the matter forming the cluster fell into the center to form one large galaxy. 
B) They are the result of many galactic mergers; one galaxy growing at the expense of others. 
C) Such a large galaxy attracted smaller galaxies around it to form a cluster. 
D) Large galaxies, passing a cluster, get captured into the center. 
E) Many globular clusters swarmed together to form it. 
A) Most of the matter forming the cluster fell into the center to form one large galaxy. 
B) They are the result of many galactic mergers; one galaxy growing at the expense of others. 
C) Such a large galaxy attracted smaller galaxies around it to form a cluster. 
D) Large galaxies, passing a cluster, get captured into the center. 
E) Many globular clusters swarmed together to form it.

Question 3

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

Accepted Answer

A) .96. 
B) 3. 
C) 6. 
D) 10. 
E) 65. 
A) .96. 
B) 3. 
C) 6. 
D) 10. 
E) 65.

Question 4

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 mighttake these lobes to travel to their current locations.

Accepted Answer

Active galaxies sometimes eject jets of

Question 5

________ galaxies may bridge the gap between spiral galaxies and quasars.

Accepted Answer

A) Hickson 
B) Arp 
C) Core-halo 
D) Seyfert 
E) Hubble 
A) Hickson 
B) Arp 
C) Core-halo 
D) Seyfert 
E) Hubble

Question 6

A supernova that occurs 10,000 years from now in a galaxy 50,000 light-years away:

Accepted Answer

A) will be observed on Earth 10,000 years from now. 
B) was observed on Earth 40,000 years ago. 
C) will be observed on Earth 40,000 years from now. 
D) was observed on Earth 50,000 years ago. 
E) will be observed on Earth 50,0000 years from now. 
A) will be observed on Earth 10,000 years from now. 
B) was observed on Earth 40,000 years ago. 
C) will be observed on Earth 40,000 years from now. 
D) was observed on Earth 50,000 years ago. 
E) will be observed on Earth 50,0000 years from now.

Question 7

When observing a very distant quasar, we are actually seeing the universe the way it waswhen it was much younger than it is today.

Accepted Answer

A) True 
 B)False

Question 8

Spiral galaxies are much more common in the centers of rich clusters than in the universe asa whole.

Accepted Answer

A) True 
 B)False

Question 9

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 10

Galaxies in clusters are much more likely to become "active" than ones alone in space.

Accepted Answer

A) True 
 B)False

Question 11

Supermassive elliptical galaxies have been seen to have how many supermassive black holesin or near their center?

Accepted Answer

A) none 
B) always one 
C) at least one; no more than a few 
D) dozens 
E) hundreds 
A) none 
B) always one 
C) at least one; no more than a few 
D) dozens 
E) hundreds

Question 12

While we know of thousands of quasars, it is likely none of them still exist today. Explain.

Accepted Answer

Quasars are associated with the gravitat

Question 13

A galaxy is at a distance of one billion light-years. Which of the following is true?

Accepted Answer

A) We see the galaxy the way it will be in one billion years. 
B) We see the galaxy the way it was one billion years ago. 
C) We see the galaxy the way it was when the universe was one billion years old. 
D) We see what our galaxy will be like in one billion years. 
E) We have no knowledge of anything at that distance. 
A) We see the galaxy the way it will be in one billion years. 
B) We see the galaxy the way it was one billion years ago. 
C) We see the galaxy the way it was when the universe was one billion years old. 
D) We see what our galaxy will be like in one billion years. 
E) We have no knowledge of anything at that distance.

Question 14

While our Milky Way's black hole is not massive enough to have once been a quasar, it musthave passed through its Seyfert phase by 3.5 billion years ago. Explain how we know this.

Accepted Answer

We are here. Life on Earth would have be

Question 15

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

Accepted Answer

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

Question 16

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 17

Gravitational lensing of distant, faint irregular galaxies may be the key to:

Accepted Answer

A) mapping the dark matter. 
B) quasar energy production. 
C) understanding galactic rotation curves. 
D) understanding active galactic nuclei. 
E) determining galactic redshifts. 
A) mapping the dark matter. 
B) quasar energy production. 
C) understanding galactic rotation curves. 
D) understanding active galactic nuclei. 
E) determining galactic redshifts.

Question 18

Why would spiral galaxies be less common now than in the early universe?

Accepted Answer

As galaxies collide they chang

Question 19

Infall of ________ may explain the higher than expected star formation rates in galaxies.

Accepted Answer

The answer of Infall of ________ may explain the higher...

Question 20

The extended sheet of galaxies that spans $70 \mathrm { Mpc } \times 200 \mathrm { Mpc }$ nd includes about 24,000galaxies is called the ________.

Accepted Answer

The answer of The extended sheet of galaxies that spans...

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

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

Why are supermassive galaxies often found at the cores of rich galaxy clusters?

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

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 mighttake these lobes to travel to their current locations.

________ galaxies may bridge the gap between spiral galaxies and quasars.

A supernova that occurs 10,000 years from now in a galaxy 50,000 light-years away:

When observing a very distant quasar, we are actually seeing the universe the way it waswhen it was much younger than it is today.

Spiral galaxies are much more common in the centers of rich clusters than in the universe asa whole.

Rotation curves for spiral galaxies show:

Galaxies in clusters are much more likely to become "active" than ones alone in space.

Supermassive elliptical galaxies have been seen to have how many supermassive black holesin or near their center?

While we know of thousands of quasars, it is likely none of them still exist today. Explain.

A galaxy is at a distance of one billion light-years. Which of the following is true?

While our Milky Way's black hole is not massive enough to have once been a quasar, it musthave passed through its Seyfert phase by 3.5 billion years ago. Explain how we know this.

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

Redshift surveys give us:

Gravitational lensing of distant, faint irregular galaxies may be the key to:

Why would spiral galaxies be less common now than in the early universe?

Infall of ________ may explain the higher than expected star formation rates in galaxies.

The extended sheet of galaxies that spans 70Mpc×200Mpc70 \mathrm { Mpc } \times 200 \mathrm { Mpc }70Mpc×200Mpc nd includes about 24,000galaxies is called the ________.

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: Earths 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

Filters

The extended sheet of galaxies that spans $70 \mathrm { Mpc } \times 200 \mathrm { Mpc }$ nd includes about 24,000galaxies is called the ________.