Question 1

In the late 1990's, it was announced that the expansion of the Universe is accelerating. What does this imply from the perspective of the big bang

Accepted Answer

A) A force exists that we knew nothing about that causes the acceleration. 
B) The Universe must be closed. 
C) The Universe is finite. 
D) The amount of dark matter must be greatly less than the amount of normal matter. 
E) The Universe must be infinitely old. 
A) A force exists that we knew nothing about that causes the acceleration. 
B) The Universe must be closed. 
C) The Universe is finite. 
D) The amount of dark matter must be greatly less than the amount of normal matter. 
E) The Universe must be infinitely old.

Question 2

The assumption of homogeneity states that

Accepted Answer

A) the Universe looks the same at all epochs. 
B) the Universe looks the same from all locations over sufficiently great distances. 
C) the Universe looks the same in all directions over sufficiently great distances. 
D) the Universe looks the same at all epochs, the Universe looks the same from all locations over sufficiently great distances, and the Universe looks the same in all directions over sufficiently great distances. 
E) None of the other choices are correct. 
A) the Universe looks the same at all epochs. 
B) the Universe looks the same from all locations over sufficiently great distances. 
C) the Universe looks the same in all directions over sufficiently great distances. 
D) the Universe looks the same at all epochs, the Universe looks the same from all locations over sufficiently great distances, and the Universe looks the same in all directions over sufficiently great distances. 
E) None of the other choices are correct.

Question 3

The density of the Universe is

Accepted Answer

A) equal to the critical density if the Universe is closed. 
B) equal to the critical density if the Universe is flat. 
C) greater than the critical density if the Universe is flat. 
D) greater than the critical density if the Universe is open. 
E) None of the other choices are correct. 
A) equal to the critical density if the Universe is closed. 
B) equal to the critical density if the Universe is flat. 
C) greater than the critical density if the Universe is flat. 
D) greater than the critical density if the Universe is open. 
E) None of the other choices are correct.

Question 4

After recombination occurred, the Universe was plunged into a period of time known as the ___________, which lasted hundreds of millions of years until the first stars were born.

Accepted Answer

The answer of After recombination occurred, the Universe was plunged...

Question 5

If the Universe is closed, then its age will be

Accepted Answer

A) less than two-thirds of 1/H. 
B) more than two-thirds of 1/H. 
C) equal to 1/H. 
D) equal to H squared. 
E) equal to the square-root of H. 
A) less than two-thirds of 1/H. 
B) more than two-thirds of 1/H. 
C) equal to 1/H. 
D) equal to H squared. 
E) equal to the square-root of H.

Question 6

During its early history, matter dominated the Universe.

Accepted Answer

A) True 
 B)False

Question 7

Possible equations (choose the correct one): $τ =10^{12}$/H; H=v/d. If gravity is unimportant and H equals 75 km/s/Mpc, then the age of the universe is about

Accepted Answer

A) 8.9 billion years. 
B) 13 billion years. 
C) 16.6 billion years. 
D) 26 billion years. 
E) 74 billion years. 
A) 8.9 billion years. 
B) 13 billion years. 
C) 16.6 billion years. 
D) 26 billion years. 
E) 74 billion years.

Question 8

Isotropic is the same as homogeneous.

Accepted Answer

A) True 
 B)False

Question 9

The redshifts of the galaxies imply that the Universe is expanding and that we are at the center.

Accepted Answer

A) True 
 B)False

Question 10

If in every direction we point to a star, then the conundrum that the sky is dark is known as ___________.

Accepted Answer

The answer of If in every direction we point to...

Question 11

-Which of the following is NOT true about the above graph

Accepted Answer

A) Helium was formed early in the universe but the universe became too cool for the fusion to continue. 
B) Recombination occurs at a lower temperature than electron-positron annihilation. 
C) A time existed where neither radiation nor matter dominated in the universe. 
D) Temperature increases with time. 
A) Helium was formed early in the universe but the universe became too cool for the fusion to continue. 
B) Recombination occurs at a lower temperature than electron-positron annihilation. 
C) A time existed where neither radiation nor matter dominated in the universe. 
D) Temperature increases with time.

Question 12

Antiprotons and positrons are examples of ______________, which are not ordinary matter.

Accepted Answer

The answer of Antiprotons and positrons are examples of ______________,...

Question 13

The Hubble time is

Accepted Answer

A) the time it takes a galaxy moving at 1000 km/s to move 1 Mpc. 
B) the time it takes the galaxy to double its size. 
C) the time since recombination occurred. 
D) the time remaining before the Universe stops expanding and begins to contract. 
E) an estimate of the age of the Universe based on the Hubble constant. 
A) the time it takes a galaxy moving at 1000 km/s to move 1 Mpc. 
B) the time it takes the galaxy to double its size. 
C) the time since recombination occurred. 
D) the time remaining before the Universe stops expanding and begins to contract. 
E) an estimate of the age of the Universe based on the Hubble constant.

Question 14

Describe how we know that the expansion rate of the Universe is currently accelerating.

Accepted Answer

A study of type Ia supernovae showed tha

Question 15

The ___________ view of the Universe is that it is eternal and unchanging.

Accepted Answer

A) inflationary 
B) accelerating 
C) static 
D) big bang 
A) inflationary 
B) accelerating 
C) static 
D) big bang

Question 16

WIMPs are an example of baryonic matter.

Accepted Answer

A) True 
 B)False

Question 17

-Which of the above galaxy spectra has the highest blueshift as indicated by velocity value

Accepted Answer

A) 1,200 km/s 
B) 15,000 km/s 
C) 61,000 km/s 
D) None of the other choices are correct. 
A) 1,200 km/s 
B) 15,000 km/s 
C) 61,000 km/s 
D) None of the other choices are correct.

Question 18

What is the difference between homogeneity and isotropy

Accepted Answer

Think of a dart board. Isotropy is radia

Question 19

Where did the cosmic microwave background (CMB) come from

Accepted Answer

A) photons emitted from the first stars 
B) photons released from hydrogen in our galaxy 
C) light scattered by dust in our Solar System 
D) photons released when electrons and nuclei combined for the first time 
A) photons emitted from the first stars 
B) photons released from hydrogen in our galaxy 
C) light scattered by dust in our Solar System 
D) photons released when electrons and nuclei combined for the first time

Question 20

Inflation explains the horizon and flatness problems.

Accepted Answer

A) True 
 B)False

In the late 1990's, it was announced that the expansion of the Universe is accelerating. What does this imply from the perspective of the big bang

The assumption of homogeneity states that

The density of the Universe is

After recombination occurred, the Universe was plunged into a period of time known as the ___________, which lasted hundreds of millions of years until the first stars were born.

If the Universe is closed, then its age will be

During its early history, matter dominated the Universe.

Possible equations (choose the correct one): $τ =10^{12}$ /H; H=v/d. If gravity is unimportant and H equals 75 km/s/Mpc, then the age of the universe is about

Isotropic is the same as homogeneous.

The redshifts of the galaxies imply that the Universe is expanding and that we are at the center.

If in every direction we point to a star, then the conundrum that the sky is dark is known as ___________.

-Which of the following is NOT true about the above graph

Antiprotons and positrons are examples of ______________, which are not ordinary matter.

The Hubble time is

Describe how we know that the expansion rate of the Universe is currently accelerating.

The ___________ view of the Universe is that it is eternal and unchanging.

WIMPs are an example of baryonic matter.

-Which of the above galaxy spectra has the highest blueshift as indicated by velocity value

What is the difference between homogeneity and isotropy

Where did the cosmic microwave background (CMB) come from

Inflation explains the horizon and flatness problems.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

The Origin of the Solar System

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Exam 14: Modern Cosmology

In the late 1990's, it was announced that the expansion of the Universe is accelerating. What does this imply from the perspective of the big bang

The assumption of homogeneity states that

The density of the Universe is

After recombination occurred, the Universe was plunged into a period of time known as the ___________, which lasted hundreds of millions of years until the first stars were born.

If the Universe is closed, then its age will be

During its early history, matter dominated the Universe.

Possible equations (choose the correct one): τ=1012τ =10^{12}τ=1012 /H; H=v/d. If gravity is unimportant and H equals 75 km/s/Mpc, then the age of the universe is about

Isotropic is the same as homogeneous.

The redshifts of the galaxies imply that the Universe is expanding and that we are at the center.

If in every direction we point to a star, then the conundrum that the sky is dark is known as ___________.

-Which of the following is NOT true about the above graph

Antiprotons and positrons are examples of ______________, which are not ordinary matter.

The Hubble time is

Describe how we know that the expansion rate of the Universe is currently accelerating.

The ___________ view of the Universe is that it is eternal and unchanging.

WIMPs are an example of baryonic matter.

-Which of the above galaxy spectra has the highest blueshift as indicated by velocity value

What is the difference between homogeneity and isotropy

Where did the cosmic microwave background (CMB) come from

Inflation explains the horizon and flatness problems.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

The Origin of the Solar System

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Possible equations (choose the correct one): $τ =10^{12}$ /H; H=v/d. If gravity is unimportant and H equals 75 km/s/Mpc, then the age of the universe is about