Question 1

How massive are the largest known galaxies?

Accepted Answer

A)  a few million solar masses 
B)  a hundred million solar masses 
C)  a few billion solar masses 
D)  a trillion solar masses 
E)  hundreds of trillions of solar masses 
A)  a few million solar masses 
B)  a hundred million solar masses 
C)  a few billion solar masses 
D)  a trillion solar masses 
E)  hundreds of trillions of solar masses

Question 2

A radio galaxy whose lobes are swept back as if forming a tail.This probably indicates that:

Accepted Answer

A)  this is evidence for intergalactic matter. 
B)  the galaxy is about to evolve into a spiral. 
C)  the galaxy is isolated, not part of a cluster. 
D)  the galaxy is moving towards Earth. 
E)  there must be another galaxy nearby. 
A)  this is evidence for intergalactic matter. 
B)  the galaxy is about to evolve into a spiral. 
C)  the galaxy is isolated, not part of a cluster. 
D)  the galaxy is moving towards Earth. 
E)  there must be another galaxy nearby.

Question 3

Describe how gravitational lensing works.What can it tell us about a quasar? What can it tell us about the galaxy that is doing the lensing? How is lensing valuable to the study of dark matter?

Accepted Answer

Gravitational lensing occurs when a near

Question 4

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 5

While our Milky Way's black hole is not massive enough to have once been quasar,it must have 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 bee

Question 6

What is the Great Wall?

Accepted Answer

A)  It is a ridge on the Moon near the crater Birt. 
B)  It is the distance beyond which astronomers cannot view any more galaxies or even quasars. 
C)  It is a large sheet of galaxies measuring 70 Mpc by 200 Mpc. 
D)  It is the time before the universe started expanding, about which we can never know anything. 
E)  It is an enormous intergalactic cloud of dust and gas that hides more distant galaxies. 
A)  It is a ridge on the Moon near the crater Birt. 
B)  It is the distance beyond which astronomers cannot view any more galaxies or even quasars. 
C)  It is a large sheet of galaxies measuring 70 Mpc by 200 Mpc. 
D)  It is the time before the universe started expanding, about which we can never know anything. 
E)  It is an enormous intergalactic cloud of dust and gas that hides more distant galaxies.

Question 7

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 8

The ________ phenomenon is an extremely energetic event which apparently occurs in the nuclei of massive galaxies during an early stage of their evolution.

Accepted Answer

The answer of The ________ phenomenon is an extremely energetic...

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

A red supergiant is observed in a globular cluster in another galaxy (located 150,000 light years away).It is predicted,based on its mass and age of the star that it will supernova in about 10,000 years.When will this supernova be visible on Earth?

Accepted Answer

A)  10,000 years from now 
B)  10,000 years ago 
C)  150,000 years from now 
D)  150,000 years ago 
E)  160,000 years from now 
A)  10,000 years from now 
B)  10,000 years ago 
C)  150,000 years from now 
D)  150,000 years ago 
E)  160,000 years from now

Question 11

The peak of the quasar epoch was:

Accepted Answer

A)  when there was still enough dark matter to fuel the supermassive black holes in their bar. 
B)  when there was still sufficient mass to fuel the supermassive black holes at their center. 
C)  before the formation of galaxies. 
D)  before the star formation epoch. 
E)  before mass had a chance to accumulate at the nucleus. 
A)  when there was still enough dark matter to fuel the supermassive black holes in their bar. 
B)  when there was still sufficient mass to fuel the supermassive black holes at their center. 
C)  before the formation of galaxies. 
D)  before the star formation epoch. 
E)  before mass had a chance to accumulate at the nucleus.

Question 12

What is a galaxy's rotation curve? To which galaxies is it best applied,and what does it tell us about the distribution of dark matter?

Accepted Answer

The speed of rotation at various distanc

Question 13

Voids contain about what percentage of the universe's mass?

Accepted Answer

A)  0 
B)  5-10 
C)  40-50 
D)  100 
E)  cannot be determined 
A)  0 
B)  5-10 
C)  40-50 
D)  100 
E)  cannot be determined

Question 14

From studies of the masses of individual galaxies and the masses of clusters of galaxies,it is now apparent that up to ________ of the universe is composed of dark matter.

Accepted Answer

The answer of From studies of the masses of individual...

Question 15

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

Accepted Answer

A)  1 solar mass per 100 years. 
B)  1 solar mass per 10,000 years. 
C)  1 Jupiter mass per year. 
D)  10 solar masses per year. 
E)  1,000 solar masses per year. 
A)  1 solar mass per 100 years. 
B)  1 solar mass per 10,000 years. 
C)  1 Jupiter mass per year. 
D)  10 solar masses per year. 
E)  1,000 solar masses per year.

Question 16

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 17

Giant elliptical galaxies may be the result of ________ in the centers of rich clusters.

Accepted Answer

galaxy mer

Question 18

For nearby spirals,their rotation curves help measure both light and dark matter.

Accepted Answer

A) True 
 B)False

Question 19

The type of radio galaxy that reveals its motion through the intergalactic medium is called a:

Accepted Answer

A)  quasar. 
B)  dual lobe. 
C)  bi-polar jet. 
D)  head-tail. 
E)  Seyfert. 
A)  quasar. 
B)  dual lobe. 
C)  bi-polar jet. 
D)  head-tail. 
E)  Seyfert.

Question 20

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.

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

How massive are the largest known galaxies?

A radio galaxy whose lobes are swept back as if forming a tail.This probably indicates that:

Describe how gravitational lensing works.What can it tell us about a quasar? What can it tell us about the galaxy that is doing the lensing? How is lensing valuable to the study of dark matter?

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

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

What is the Great Wall?

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

The ________ phenomenon is an extremely energetic event which apparently occurs in the nuclei of massive galaxies during an early stage of their evolution.

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

A red supergiant is observed in a globular cluster in another galaxy (located 150,000 light years away).It is predicted,based on its mass and age of the star that it will supernova in about 10,000 years.When will this supernova be visible on Earth?

The peak of the quasar epoch was:

What is a galaxy's rotation curve? To which galaxies is it best applied,and what does it tell us about the distribution of dark matter?

Voids contain about what percentage of the universe's mass?

From studies of the masses of individual galaxies and the masses of clusters of galaxies,it is now apparent that up to ________ of the universe is composed of dark matter.

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

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

Giant elliptical galaxies may be the result of ________ in the centers of rich clusters.

For nearby spirals,their rotation curves help measure both light and dark matter.

The type of radio galaxy that reveals its motion through the intergalactic medium is called a:

Rotation curves for spiral galaxies show:

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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