Question 1

When we measure distances to very faint galaxies with Type Ia supernovae,the accuracy of the measurement is only as good as that of the calibration of the Cepheids.

Accepted Answer

A) True 
 B)False  True

Question 2

In the Great Debate of 1920,Curtis and Shapley argued over whether or not:

Accepted Answer

A)  the Big Bang occurred 
B)  the age of the universe was 14 billion years 
C)  the spiral nebulae were located outside the Milky Way 
D)  life existed outside of Earth 
A)  the Big Bang occurred 
B)  the age of the universe was 14 billion years 
C)  the spiral nebulae were located outside the Milky Way 
D)  life existed outside of Earth C

Question 3

There is no special center to the expansion of the universe.

Accepted Answer

A) True 
 B)False  True

Question 4

If the distance of a galaxy at a redshift z = 0.5 is 1,800 Mpc,how many years back into the past are we looking when we observe this galaxy?

Accepted Answer

A)  500 million years 
B)  2 billion years 
C)  6 billion years 
D)  9 billion years 
A)  500 million years 
B)  2 billion years 
C)  6 billion years 
D)  9 billion years

Question 5

The cosmic microwave background radiation is a snapshot of the radiation in the universe at a redshift of z$\approx$1,000 when the universe was:

Accepted Answer

A)  1,000 times smaller than it is today 
B)  10 times smaller than it is today 
C)  2 times smaller than it is today 
D)  the same size as it is today 
A)  1,000 times smaller than it is today 
B)  10 times smaller than it is today 
C)  2 times smaller than it is today 
D)  the same size as it is today

Question 6

The apparent recessional velocities of galaxies at large distances are due mainly to the actual motions of the galaxies through space.

Accepted Answer

A) True 
 B)False

Question 7

Galaxies move away from us in all directions because:

Accepted Answer

A)  the force of gravity strengthens with distance 
B)  the force of gravity weakens with distance 
C)  space is expanding 
D)  our galaxy has expelled all other galaxies 
A)  the force of gravity strengthens with distance 
B)  the force of gravity weakens with distance 
C)  space is expanding 
D)  our galaxy has expelled all other galaxies

Question 8

What does the value of RU,the scale factor,tell us?

Accepted Answer

The scale factor tel

Question 9

The figure below indicates a possible picture of a theoretical universe filled with galaxies moving as shown with two separate observers within it.Which of the following statements describes this universe?

Accepted Answer

A)  This universe is homogeneous but not isotropic. 
B)  This universe is isotropic but not homogeneous. 
C)  This universe is both homogeneous and isotropic. 
D)  This universe is neither homogeneous nor isotropic. 
A)  This universe is homogeneous but not isotropic. 
B)  This universe is isotropic but not homogeneous. 
C)  This universe is both homogeneous and isotropic. 
D)  This universe is neither homogeneous nor isotropic.

Question 10

What were the positions taken by Heber Curtis and Harlow Shapley in their "Great Debate," and how were both of them partially correct?

Accepted Answer

Curtis believed in a smaller galaxy (rou

Question 11

Assuming a Hubble time of 13.6 billion years and a constant rate of expansion of the universe,what was the scale factor (RU)of the universe 10.2 billion years ago (compared to today)?

Accepted Answer

A)  0.25 
B)  0.50 
C)  0.67 
D)  0.75 
A)  0.25 
B)  0.50 
C)  0.67 
D)  0.75

Question 12

What do astronomers mean when they say that the universe is homogeneous?

Accepted Answer

A)  All stars in all galaxies have planetary systems just like ours. 
B)  The universe looks the same no matter where you look. 
C)  Galaxies are generally distributed similarly throughout the universe. 
D)  Generally speaking,there is little difference between conditions on Earth,in the Sun,or in outer space. 
A)  All stars in all galaxies have planetary systems just like ours. 
B)  The universe looks the same no matter where you look. 
C)  Galaxies are generally distributed similarly throughout the universe. 
D)  Generally speaking,there is little difference between conditions on Earth,in the Sun,or in outer space.

Question 13

Name three "rungs" in the distance ladder that let us estimate the value of H0.

Accepted Answer

Trigonometric parallax,period-

Question 14

Which distance indicator can be used to measure the most distant objects?

Accepted Answer

A)  Cepheids 
B)  Parallax 
C)  Type Ia supernovae 
D)  Main-sequence fitting 
A)  Cepheids 
B)  Parallax 
C)  Type Ia supernovae 
D)  Main-sequence fitting

Question 15

Where in the universe did the Big Bang take place?

Accepted Answer

A)  Near the Milky Way Galaxy 
B)  Near the Virgo cluster 
C)  Near some unknown location on the other side of the universe 
D)  Everywhere in the universe 
A)  Near the Milky Way Galaxy 
B)  Near the Virgo cluster 
C)  Near some unknown location on the other side of the universe 
D)  Everywhere in the universe

Question 16

Edwin Hubble revolutionized astronomy when he made an accurate calculation of the distance to the Andromeda Nebula by spotting a rare Type Ia supernova.

Accepted Answer

A) True 
 B)False

Question 17

The inverse of the value of H0 is a:

Accepted Answer

A)  time 
B)  mass 
C)  density 
D)  size 
A)  time 
B)  mass 
C)  density 
D)  size

Question 18

The current temperature of the cosmic microwave background radiation is 17 K.

Accepted Answer

A) True 
 B)False

Question 19

The abundance of various elements formed from Big Bang nucleosynthesis depended only on the temperature of normal matter in the early universe.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following was NOT created as a result of Big Bang nucleosynthesis?

Accepted Answer

A)  Helium 
B)  Lithium 
C)  Carbon 
D)  Deuterium 
A)  Helium 
B)  Lithium 
C)  Carbon 
D)  Deuterium

When we measure distances to very faint galaxies with Type Ia supernovae,the accuracy of the measurement is only as good as that of the calibration of the Cepheids.

In the Great Debate of 1920,Curtis and Shapley argued over whether or not:

There is no special center to the expansion of the universe.

If the distance of a galaxy at a redshift z = 0.5 is 1,800 Mpc,how many years back into the past are we looking when we observe this galaxy?

The cosmic microwave background radiation is a snapshot of the radiation in the universe at a redshift of z $\approx$ 1,000 when the universe was:

The apparent recessional velocities of galaxies at large distances are due mainly to the actual motions of the galaxies through space.

Galaxies move away from us in all directions because:

What does the value of R_U,the scale factor,tell us?

The figure below indicates a possible picture of a theoretical universe filled with galaxies moving as shown with two separate observers within it.Which of the following statements describes this universe?

What were the positions taken by Heber Curtis and Harlow Shapley in their "Great Debate," and how were both of them partially correct?

Assuming a Hubble time of 13.6 billion years and a constant rate of expansion of the universe,what was the scale factor (R_U)of the universe 10.2 billion years ago (compared to today)?

What do astronomers mean when they say that the universe is homogeneous?

Name three "rungs" in the distance ladder that let us estimate the value of H₀.

Which distance indicator can be used to measure the most distant objects?

Where in the universe did the Big Bang take place?

Edwin Hubble revolutionized astronomy when he made an accurate calculation of the distance to the Andromeda Nebula by spotting a rare Type Ia supernova.

The inverse of the value of H₀ is a:

The current temperature of the cosmic microwave background radiation is 17 K.

The abundance of various elements formed from Big Bang nucleosynthesis depended only on the temperature of normal matter in the early universe.

Which of the following was NOT created as a result of Big Bang nucleosynthesis?

Our Place in the Universe

Patterns in the Skymotions of Earth

Laws of Motion

Light and Telescopes

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, Earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: The Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

The Realm of the Galaxies

Our Galaxy: The Milky Way

Modern Cosmology and the Origin of Structure

Life in the Universe

Filters

Exam 14: The Expansion of Space

When we measure distances to very faint galaxies with Type Ia supernovae,the accuracy of the measurement is only as good as that of the calibration of the Cepheids.

In the Great Debate of 1920,Curtis and Shapley argued over whether or not:

There is no special center to the expansion of the universe.

If the distance of a galaxy at a redshift z = 0.5 is 1,800 Mpc,how many years back into the past are we looking when we observe this galaxy?

The cosmic microwave background radiation is a snapshot of the radiation in the universe at a redshift of z ≈\approx≈ 1,000 when the universe was:

The apparent recessional velocities of galaxies at large distances are due mainly to the actual motions of the galaxies through space.

Galaxies move away from us in all directions because:

What does the value of RU,the scale factor,tell us?

The figure below indicates a possible picture of a theoretical universe filled with galaxies moving as shown with two separate observers within it.Which of the following statements describes this universe?

What were the positions taken by Heber Curtis and Harlow Shapley in their "Great Debate," and how were both of them partially correct?

Assuming a Hubble time of 13.6 billion years and a constant rate of expansion of the universe,what was the scale factor (RU)of the universe 10.2 billion years ago (compared to today)?

What do astronomers mean when they say that the universe is homogeneous?

Name three "rungs" in the distance ladder that let us estimate the value of H0.

Which distance indicator can be used to measure the most distant objects?

Where in the universe did the Big Bang take place?

Edwin Hubble revolutionized astronomy when he made an accurate calculation of the distance to the Andromeda Nebula by spotting a rare Type Ia supernova.

The inverse of the value of H0 is a:

The current temperature of the cosmic microwave background radiation is 17 K.

The abundance of various elements formed from Big Bang nucleosynthesis depended only on the temperature of normal matter in the early universe.

Which of the following was NOT created as a result of Big Bang nucleosynthesis?

Our Place in the Universe

Patterns in the Skymotions of Earth

Laws of Motion

Light and Telescopes

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, Earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: The Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

The Realm of the Galaxies

Our Galaxy: The Milky Way

Modern Cosmology and the Origin of Structure

Life in the Universe

Filters

The cosmic microwave background radiation is a snapshot of the radiation in the universe at a redshift of z $\approx$ 1,000 when the universe was:

What does the value of R_U,the scale factor,tell us?

Assuming a Hubble time of 13.6 billion years and a constant rate of expansion of the universe,what was the scale factor (R_U)of the universe 10.2 billion years ago (compared to today)?

Name three "rungs" in the distance ladder that let us estimate the value of H₀.

The inverse of the value of H₀ is a: