Question 1

According to the data from the microwave background radiation, at what speed and in whatdirection is Earth moving through the universe?

Accepted Answer

A)  380 km/s in the direction of Leo
B)  70 km/s in the direction of the Big Bang
C)  300,000 km/s in the direction of Polaris
D)  250 km/s in the direction of Vega
E)  600 km/s NorthF) C) and D)
G) None of the above

Question 2

The Hubble time is expressed as:

Accepted Answer

A)  H × D.
B)  D/v.
C)  1/H.
D)  H × T.
E)  the critical density/H.F) A) and D)
G) B) and C)

Question 3

The Big Bang was an explosion, similar to a hydrogen bomb, but on a much larger scale.

Accepted Answer

A) True 
 B)False

Question 4

The Big Bang was an expansion of matter into empty space.

Accepted Answer

A) True 
 B)False

Question 5

According to the microwave background radiation, Earth is:

Accepted Answer

A)  at the center of the universe.
B)  near the location of the Big Bang.
C)  in no special location in the universe.
D)  in a part of the universe that is just like any other part.
E)  moving at about 380 km/s toward Leo.F) A) and B)
G) B) and D)

Question 6

On the surface of a sphere the shortest distance between two points is:

Accepted Answer

A)  an arc on a great circle.
B)  a straight line.
C)  a circle.
D)  a triangle.
E)  a curvy line.F) A) and D)
G) None of the above

Question 7

The closed universe would give the cosmos a spherical geometry in space-time.

Accepted Answer

A) True 
 B)False

Question 8

Astronomers know the universe is expanding because:

Accepted Answer

A)  everything is moving away from us.
B)  all stars are moving away from us.
C)  most galaxies are moving away from us.
D)  galaxies farther away are moving away from us faster.
E)  there is a cosmic microwave background.F) A) and B)
G) B) and E)

Question 9

The redshift of the galaxies is correctly interpreted as:

Accepted Answer

A)  a Doppler shift due to the random motions of galaxies in space.
B)  an aging of light as gravity weakens with time.
C)  space itself is expanding with time, so the photons are stretched while they travel throughspace.
D)  placing our Galaxy near the center of the Local Group.
E)  the differences in temperatures and star formation in old and young galaxies.F) B) and C)
G) B) and E)

Question 10

Currently we think that matter accounts for only about 27% of the cosmos, with dark energymaking up the rest.

Accepted Answer

A) True 
 B)False

Question 11

The Wilkinson Mapping Project gave:

Accepted Answer

A)    Ω0=1\Omega _ { 0 } = 1Ω0​=1  , bu matter (dark and visible) is only 27% of this; the rest is dark energy.
B)  a closed universe, where dark matter triumphs over dark energy.
C)  an exact picture of the nature of dark energy.
D)  us proof that 90% of matter is dark, only 10% normal.
E)  the background cosmic temperature is 4.36 K. F) B) and E)
G) D) and E)

Question 12

If Ωo is less than one, then:

Accepted Answer

A)  the universe is closed, and must recycle.
B)  the universe will expand forever.
C)  no matter could have existed.
D)  only dark energy exists in the universe.
E)  there is more matter than energy in the universe.F) B) and C)
G) A) and D)

Question 13

In a closed universe a beam of light will:

Accepted Answer

A)  come back to where it originated.
B)  continue on forever.
C)  move on a circular path around its origin.
D)  reflect off the edge of the universe and come back.
E)  go on some strange path, never to return.F) D) and E)
G) A) and D)

Question 14

In Robert Frost's classic poem, when he ends with "ice will suffice," the universe is:

Accepted Answer

A)  closed.
B)  critical density.
C)  open.
D)  Euclidean.
E)  Relativistic.F) A) and E)
G) A) and C)

Question 15

Einstein's cosmological constant is a leading candidate for the "dark energy."

Accepted Answer

A) True 
 B)False

Question 16

Is there enough luminous matter to stop the universe's expansion? Is there enough darkmatter? What else is there?

Accepted Answer

There seems to be only about 1-3% of the...

Question 17

A bound universe will ultimately end in a "cold death."

Accepted Answer

A) True 
 B)False

Question 18

The cosmological redshift is a direct measure of the expansion of the universe, thusindependent of direction.

Accepted Answer

A) True 
 B)False

Question 19

If the density of the universe is at the critical density, then the geometry of the universefollows ordinary Euclidean geometry.

Accepted Answer

A) True 
 B)False

Question 20

Contrast dark matter and dark energy with respect to their roles in the future of the universe.

Accepted Answer

Dark matter exerts a gravitati...

Exam 26: Cosmology: The Big Bang and the Fate of the Universe

The Big Bang was an expansion of matter into empty space.

Correct AnswerverifiedShow Answer

Contrast dark matter and dark energy with respect to their roles in the future of the universe.

Correct AnswerverifiedDark matter exerts a gravitati...View AnswerShow Answer

Is there enough luminous matter to stop the universe's expansion? Is there enough darkmatter? What else is there?

Correct AnswerverifiedThere seems to be only about 1-3% of the...View AnswerShow Answer

Einstein's cosmological constant is a leading candidate for the "dark energy."

Correct AnswerverifiedShow Answer

Astronomers know the universe is expanding because:

Correct AnswerverifiedShow Answer

If Ωo is less than one, then:

Correct AnswerverifiedShow Answer

The Hubble time is expressed as:

Correct AnswerverifiedShow Answer

According to the microwave background radiation, Earth is:

Correct AnswerverifiedShow Answer

The Big Bang was an explosion, similar to a hydrogen bomb, but on a much larger scale.

Correct AnswerverifiedShow Answer

In Robert Frost's classic poem, when he ends with "ice will suffice," the universe is:

Correct AnswerverifiedShow Answer

The closed universe would give the cosmos a spherical geometry in space-time.

Correct AnswerverifiedShow Answer

The redshift of the galaxies is correctly interpreted as:

Correct AnswerverifiedShow Answer

Currently we think that matter accounts for only about 27% of the cosmos, with dark energymaking up the rest.

Correct AnswerverifiedShow Answer

The Wilkinson Mapping Project gave:

Correct AnswerverifiedShow Answer

If the density of the universe is at the critical density, then the geometry of the universefollows ordinary Euclidean geometry.

Correct AnswerverifiedShow Answer

A bound universe will ultimately end in a "cold death."

Correct AnswerverifiedShow Answer

In a closed universe a beam of light will:

Correct AnswerverifiedShow Answer

According to the data from the microwave background radiation, at what speed and in whatdirection is Earth moving through the universe?

Correct AnswerverifiedShow Answer

The cosmological redshift is a direct measure of the expansion of the universe, thusindependent of direction.

Correct AnswerverifiedShow Answer

On the surface of a sphere the shortest distance between two points is:

Correct AnswerverifiedShow Answer

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Dark matter exerts a gravitati...
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There seems to be only about 1-3% of the...
View Answer

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