Question 1

"Seeds" around which galaxies, clusters and walls grew may have been_____before inflation and recombination.

Accepted Answer

A)  caused by hot dark matter 
B)  caused by baryons 
C)  the result of the separation of the electromagnetic and weak forces 
D)  the result of freezing water molecules shortly after the universe became transparent to photons 
E)  caused by initially tiny quantum mechanical fluctuations in space-time 
A)  caused by hot dark matter 
B)  caused by baryons 
C)  the result of the separation of the electromagnetic and weak forces 
D)  the result of freezing water molecules shortly after the universe became transparent to photons 
E)  caused by initially tiny quantum mechanical fluctuations in space-time

Question 2

When a proton and an antiproton collide

Accepted Answer

A)  they destroy each other and produce energy in the form of gamma rays. 
B)  one of the protons is converted to a neutron and they form a nucleus consisting of one proton and one neutron. 
C)  one of the protons is converted to an electron and they form a hydrogen atom. 
D)  one proton is converted to a neutron and the other is converted to an electron. 
E)  A proton and an antiproton cannot collide because the Coulomb barrier is too great. 
A)  they destroy each other and produce energy in the form of gamma rays. 
B)  one of the protons is converted to a neutron and they form a nucleus consisting of one proton and one neutron. 
C)  one of the protons is converted to an electron and they form a hydrogen atom. 
D)  one proton is converted to a neutron and the other is converted to an electron. 
E)  A proton and an antiproton cannot collide because the Coulomb barrier is too great.

Question 3

What is the difference between homogeneity and isotropy?

Accepted Answer

The answer of What is the difference between homogeneity and...

Question 4

Whether the universe is open, closed or flat depends, on the ____ of the universe.

Accepted Answer

A)  luminosity 
B)  density 
C)  temperature 
D)  radius 
E)  rotation rate 
A)  luminosity 
B)  density 
C)  temperature 
D)  radius 
E)  rotation rate

Question 5

A(n) ____________________ universe is infinite and would have a density equal to the critical density.

Accepted Answer

The answer of A(n) ____________________ universe is infinite and would...

Question 6

The cosmological principle states that any observer in any galaxy will see the same general features of the universe.

Accepted Answer

A) True 
 B)False

Question 7

What evidence do we have that the universe is expanding?

Accepted Answer

The evidence for the expansion of the un

Question 8

The night sky is dark because the universe is not infinitely old.

Accepted Answer

A) True 
 B)False

Question 9

According to the steady state theory, the universe did not expand.

Accepted Answer

A) True 
 B)False

Question 10

During its early history, matter dominated the universe.

Accepted Answer

A) True 
 B)False

Question 11

How could the inflationary universe solve the horizon problem?

Accepted Answer

The inflationary universe model proposes

Question 12

The ____________________ are theories that unify the electromagnetic, weak, and strong forces at extremely high energies.

Accepted Answer

grand unif

Question 13

The cosmic microwave background radiation was released shortly after the formation of the first stars.

Accepted Answer

A) True 
 B)False

"Seeds" around which galaxies, clusters and walls grew may have been_____before inflation and recombination.

When a proton and an antiproton collide

What is the difference between homogeneity and isotropy?

Whether the universe is open, closed or flat depends, on the ____ of the universe.

A(n) ____________________ universe is infinite and would have a density equal to the critical density.

The cosmological principle states that any observer in any galaxy will see the same general features of the universe.

What evidence do we have that the universe is expanding?

The night sky is dark because the universe is not infinitely old.

According to the steady state theory, the universe did not expand.

During its early history, matter dominated the universe.

How could the inflationary universe solve the horizon problem?

The ____________________ are theories that unify the electromagnetic, weak, and strong forces at extremely high energies.

The cosmic microwave background radiation was released shortly after the formation of the first stars.

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

"Seeds" around which galaxies, clusters and walls grew may have been_____before inflation and recombination.

When a proton and an antiproton collide

What is the difference between homogeneity and isotropy?

Whether the universe is open, closed or flat depends, on the ____ of the universe.

A(n) ____________________ universe is infinite and would have a density equal to the critical density.

The cosmological principle states that any observer in any galaxy will see the same general features of the universe.

What evidence do we have that the universe is expanding?

The night sky is dark because the universe is not infinitely old.

According to the steady state theory, the universe did not expand.

During its early history, matter dominated the universe.

How could the inflationary universe solve the horizon problem?

The ____________________ are theories that unify the electromagnetic, weak, and strong forces at extremely high energies.

The cosmic microwave background radiation was released shortly after the formation of the first stars.

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