Question 1

The Universe is _______________ because it looks the same in any direction you observe it.

Accepted Answer

The answer of The Universe is _______________ because it looks...

Question 2

The Universe is isotropic, but not homogenous.

Accepted Answer

A) True 
 B)False

Question 3

10 B)  108 C)  106 D)  105 E)  104" class="answers-bank-image d-inline" rel="preload" > Figure 17-1
One year after the Big Bang, the temperature of the Universe was approximately____ degrees kelvin. (Refer to Figure 17-1.)

Accepted Answer

A)   1010
B)   108
C)   106
D)   105
E)   104F) B) and C)
G) All of the above

Question 4

If the dark energy is described by the cosmological constant, then the _____ Universe is ____.

Accepted Answer

A)   open; accelerating and will not expand forever
B)   flat; decelerating and will expand forever
C)   closed; accelerating and will expand forever
D)   open;, decelerating and will expand forever
E)   flat; accelerating and will expand foreverF) B) and E)
G) A) and E)

Question 5

Dark energy accounts for about 70% of the critical density of the Universe.

Accepted Answer

A) True 
 B)False

Question 6

Scientists who study the Universe as a whole are called _______________.

Accepted Answer

The answer of Scientists who study the Universe as a...

Question 7

Olber's paradox states that the ____.

Accepted Answer

A)   Universe must have a center, but not an edge
B)   sky should be as bright as the surface of a star in all directions
C)   Universe should have an edge, but not a center
D)   Earth should be at the farthest point in the Universe from the Big Bang.
E)   Universe is not infinite, but cannot have an edge or centerF) C) and D)
G) A) and B)

Question 8

The cosmic microwave background radiation comes from the time when neutral hydrogen atoms formed in the process of _______________.

Accepted Answer

The answer of The cosmic microwave background radiation comes from...

Question 9

The Hubble time is____.

Accepted Answer

A)   an estimate of the age of the Universe
B)   the time needed for a galaxy to travel 1 Mpc
C)   not connected to Hubble law of galactic redshifts
D)   the time for light to cross the Universe
E)   the time needed for galaxies to formF) B) and D)
G) A) and C)

Question 10

Dark matter must be ____.

Accepted Answer

A)   baryonic
B)   non-baryonic
C)   neutral
D)   WIMPs
E)   isochronicF) C) and E)
G) A) and E)

Question 11

Cosmologists cannot begin their history of the Big Bang at a time of exactly zero because it cannot be explained by current physics.

Accepted Answer

A) True 
 B)False

Question 12

When an astronomer measures the redshift to a distant galaxy, exactly what physical process is being measured?

Accepted Answer

Galaxies are being separated from each o...

Question 13

Einstein's mass-energy equivalence is important to the first phases of the Big Bang in explaining how____.

Accepted Answer

A)   gamma ray photons create matter and antimatter
B)   stable protons and neutrons can exist below a certain temperature
C)   antimatter can exist
D)   matter became more prevalent than antimatter
E)   the Universe expanded rapidlyF) C) and E)
G) A) and B)

Question 14

Modern observations have shown that the geometry of the Universe is ____.

Accepted Answer

A)   flat, and the Universe must be infinite
B)   flat, and the Universe must not be infinite
C)   open, and the Universe must be infinite
D)   closed, and the Universe must be infinite
E)   closed, and the Universe must not be infiniteF) A) and B)
G) A) and C)

Question 15

Olber's paradox is explained by the fact that the Universe is neither static nor infinite in age.

Accepted Answer

A) True 
 B)False

Question 16

Gravity waves produced during inflation are predicted to have caused a polarization of the cosmic microwave background.

Accepted Answer

A) True 
 B)False

Question 17

The cosmological principle states that any observer in any galaxy sees the same general properties for the Universe.

Accepted Answer

A) True 
 B)False

Question 18

The decoupling of the strong force from the electroweak force provided energy for a rapid inflation of the Universe.

Accepted Answer

A) True 
 B)False

Question 19

Arno Penzias and Robert Wilson are famous for____.

Accepted Answer

A)   creating the first microwave telescope
B)   finding the direction of the center of the Universe
C)   detecting energy released in the splitting of the electroweak force
D)   detecting the large redshift background radiation from the Big Bang
E)   measuring the temperature of the Big BangF) C) and D)
G) A) and B)

Question 20

How did dark matter behave differently from normal matter during the early stages of the Big Bang, and how is this important for the formation of stars and galaxies?

Accepted Answer

As long as radiation dominated the early...

Exam 17: Supermassive Black Holes and Active Galaxies

Dark matter must be ____.

Correct AnswerverifiedShow Answer

The Universe is _______________ because it looks the same in any direction you observe it.

Correct AnswerverifiedShow Answer

Figure 17-1 One year after the Big Bang, the temperature of the Universe was approximately____ degrees kelvin. (Refer to Figure 17-1.)

Correct AnswerverifiedShow Answer

Olber's paradox states that the ____.

Correct AnswerverifiedShow Answer

The cosmic microwave background radiation comes from the time when neutral hydrogen atoms formed in the process of _______________.

Correct AnswerverifiedShow Answer

When an astronomer measures the redshift to a distant galaxy, exactly what physical process is being measured?

Correct AnswerverifiedGalaxies are being separated from each o...View AnswerShow Answer

Dark energy accounts for about 70% of the critical density of the Universe.

Correct AnswerverifiedShow Answer

The Universe is isotropic, but not homogenous.

Correct AnswerverifiedShow Answer

The Hubble time is____.

Correct AnswerverifiedShow Answer

The decoupling of the strong force from the electroweak force provided energy for a rapid inflation of the Universe.

Correct AnswerverifiedShow Answer

Cosmologists cannot begin their history of the Big Bang at a time of exactly zero because it cannot be explained by current physics.

Correct AnswerverifiedShow Answer

Gravity waves produced during inflation are predicted to have caused a polarization of the cosmic microwave background.

Correct AnswerverifiedShow Answer

Olber's paradox is explained by the fact that the Universe is neither static nor infinite in age.

Correct AnswerverifiedShow Answer

Modern observations have shown that the geometry of the Universe is ____.

Correct AnswerverifiedShow Answer

Arno Penzias and Robert Wilson are famous for____.

Correct AnswerverifiedShow Answer

Einstein's mass-energy equivalence is important to the first phases of the Big Bang in explaining how____.

Correct AnswerverifiedShow Answer

How did dark matter behave differently from normal matter during the early stages of the Big Bang, and how is this important for the formation of stars and galaxies?

Correct AnswerverifiedAs long as radiation dominated the early...View AnswerShow Answer

If the dark energy is described by the cosmological constant, then the _____ Universe is ____.

Correct AnswerverifiedShow Answer

Scientists who study the Universe as a whole are called _______________.

Correct AnswerverifiedShow Answer

The cosmological principle states that any observer in any galaxy sees the same general properties for the Universe.

Correct AnswerverifiedShow Answer

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Galaxies are being separated from each o...
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As long as radiation dominated the early...
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If the dark energy is described by the cosmological constant, then the _ Universe is .

Correct Answer
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