Question 1

COBE and WMAP measure the temperature of the cosmic background radiation to be ____________________.

Accepted Answer

2.7 K

Question 2

The flatness problem states that

Accepted Answer

A)  the density of the universe is very close to the critical density. 
B)  the density of the universe is much larger than the critical density. 
C)  the density of the universe is much less than the critical density. 
D)  the universe is two-dimensional. 
E)  the universe is one-dimensional. 
A)  the density of the universe is very close to the critical density. 
B)  the density of the universe is much larger than the critical density. 
C)  the density of the universe is much less than the critical density. 
D)  the universe is two-dimensional. 
E)  the universe is one-dimensional. A

Question 3

A frame of the HST deep field image of distant galaxies is shown. By means of optical and radio telescopes astronomers can see distant objects like these as they

Accepted Answer

A)  are right now. 
B)  will be in the distant future. 
C)  were in the distant past. 
D)  all of the above. 
E)  none of the above. 
A)  are right now. 
B)  will be in the distant future. 
C)  were in the distant past. 
D)  all of the above. 
E)  none of the above. C

Question 4

Explain the important aspect(s) of the cosmological principle.

Accepted Answer

The cosmological principle is an importa

Question 5

Current observations indicate that the amount of baryonic matter and dark matter in the universe

Accepted Answer

A)  is sufficient great enough to overcome the expansion of the universe. 
B)  implies that the universe is closed. 
C)  is mostly in the form of black holes and quasars. 
D)  are roughly equal. 
E)  implies that the universe is open. 
A)  is sufficient great enough to overcome the expansion of the universe. 
B)  implies that the universe is closed. 
C)  is mostly in the form of black holes and quasars. 
D)  are roughly equal. 
E)  implies that the universe is open.

Question 6

Explain why the principle of homogeneity is an important aspect of the cosmological principle.

Accepted Answer

The answer of Explain why the principle of homogeneity is...

Question 7

As the universe cooled, it eventually reached a temperature of 3,000 K and protons were able to capture and hold electrons to form neutral hydrogen. This process is known as

Accepted Answer

A)  ionization. 
B)  isotropy. 
C)  annihilation. 
D)  recombination. 
E)  hydration. 
A)  ionization. 
B)  isotropy. 
C)  annihilation. 
D)  recombination. 
E)  hydration.

Question 8

If gravity alone acts to retard the expansion and nothing acts to accelerate it, the universe is said to be closed if

Accepted Answer

A)  I & II 
B)  I & III 
C)  II & III 
D)  I, I, & III 
E)  none of the above 
A)  I & II 
B)  I & III 
C)  II & III 
D)  I, I, & III 
E)  none of the above

Question 9

Space-time will be flat if

Accepted Answer

A)  the universe is expanding. 
B)  the universe is accelerating. 
C)  the average density of the universe is equal to the critical density. 
D)  the universe is finite. 
E)  the universe is homogeneous and isotropic. 
A)  the universe is expanding. 
B)  the universe is accelerating. 
C)  the average density of the universe is equal to the critical density. 
D)  the universe is finite. 
E)  the universe is homogeneous and isotropic.

Question 10

What was the temperature of the universe when the recombination took place that produced the cosmic background radiation we observe today?

Accepted Answer

A)  about 2.7 K 
B)  about 300 K 
C)  about 3000 K 
D)  about 3 million K 
E)  about 3 billion K 
A)  about 2.7 K 
B)  about 300 K 
C)  about 3000 K 
D)  about 3 million K 
E)  about 3 billion K

Question 11

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 12

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 13

What is the fate of an open universe?

Accepted Answer

A)  expansion forever 
B)  eventual collapse 
C)  gradual halt to the expansion 
D)  can't be known without density information 
A)  expansion forever 
B)  eventual collapse 
C)  gradual halt to the expansion 
D)  can't be known without density information

Question 14

The best determination of the Hubble constant using Cepheid variables found in distant galaxies by the Hubble telescope suggests

Accepted Answer

A)  that the Hubble constant is about 0.07 km/s/Mpc. 
B)  that the Hubble constant is about 7 km/s/Mpc. 
C)  that the Hubble constant is about 70 km/s/Mpc. 
D)  that the Hubble constant is about 700 km/s/Mpc. 
A)  that the Hubble constant is about 0.07 km/s/Mpc. 
B)  that the Hubble constant is about 7 km/s/Mpc. 
C)  that the Hubble constant is about 70 km/s/Mpc. 
D)  that the Hubble constant is about 700 km/s/Mpc.

Question 15

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 16

How do we know there was a big bang?

Accepted Answer

The answer of How do we know there was a...

Question 17

If the density of the universe is equal to the critical density, and H equals 50 km/s/Mpc, then the true age of the universe is 13.3 billion years.

Accepted Answer

A) True 
 B)False

Question 18

Measured ages of globular clusters suggests that the universe is about

Accepted Answer

A)  1.4 billion years old. 
B)  14 billion years old. 
C)  140 billion years old. 
A)  1.4 billion years old. 
B)  14 billion years old. 
C)  140 billion years old.

Question 19

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

Accepted Answer

We know that the expansion rate of the u

Question 20

What observational evidence supports the fact that our universe is static and unchanging?

Accepted Answer

A)  detection of the cosmic microwave background (CM
B)  
B)  dark sky at night 
C)  redshift of galaxies 
D)  evolution of galaxies with distance 
E)  none of the above 
A)  detection of the cosmic microwave background (CM
B)  
B)  dark sky at night 
C)  redshift of galaxies 
D)  evolution of galaxies with distance 
E)  none of the above

COBE and WMAP measure the temperature of the cosmic background radiation to be ____________________.

The flatness problem states that

A frame of the HST deep field image of distant galaxies is shown. By means of optical and radio telescopes astronomers can see distant objects like these as they

Explain the important aspect(s) of the cosmological principle.

Current observations indicate that the amount of baryonic matter and dark matter in the universe

Explain why the principle of homogeneity is an important aspect of the cosmological principle.

As the universe cooled, it eventually reached a temperature of 3,000 K and protons were able to capture and hold electrons to form neutral hydrogen. This process is known as

If gravity alone acts to retard the expansion and nothing acts to accelerate it, the universe is said to be closed if

Space-time will be flat if

What was the temperature of the universe when the recombination took place that produced the cosmic background radiation we observe today?

The ____ view of the universe is that it is eternal and unchanging.

Where did the cosmic microwave background (CMB) come from?

What is the fate of an open universe?

The best determination of the Hubble constant using Cepheid variables found in distant galaxies by the Hubble telescope suggests

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?

How do we know there was a big bang?

If the density of the universe is equal to the critical density, and H equals 50 km/s/Mpc, then the true age of the universe is 13.3 billion years.

Measured ages of globular clusters suggests that the universe is about

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

What observational evidence supports the fact that our universe is static and unchanging?

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

COBE and WMAP measure the temperature of the cosmic background radiation to be ____________________.

The flatness problem states that

A frame of the HST deep field image of distant galaxies is shown. By means of optical and radio telescopes astronomers can see distant objects like these as they

Explain the important aspect(s) of the cosmological principle.

Current observations indicate that the amount of baryonic matter and dark matter in the universe

Explain why the principle of homogeneity is an important aspect of the cosmological principle.

As the universe cooled, it eventually reached a temperature of 3,000 K and protons were able to capture and hold electrons to form neutral hydrogen. This process is known as

If gravity alone acts to retard the expansion and nothing acts to accelerate it, the universe is said to be closed if

Space-time will be flat if

What was the temperature of the universe when the recombination took place that produced the cosmic background radiation we observe today?

The ____ view of the universe is that it is eternal and unchanging.

Where did the cosmic microwave background (CMB) come from?

What is the fate of an open universe?

The best determination of the Hubble constant using Cepheid variables found in distant galaxies by the Hubble telescope suggests

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?

How do we know there was a big bang?

If the density of the universe is equal to the critical density, and H equals 50 km/s/Mpc, then the true age of the universe is 13.3 billion years.

Measured ages of globular clusters suggests that the universe is about

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

What observational evidence supports the fact that our universe is static and unchanging?

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