Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

Dark matter must be ____.

Accepted Answer

A)  baryonic 
B)  non-baryonic 
C)  neutral 
D)  WIMPs 
E)  isochronic 
A)  baryonic 
B)  non-baryonic 
C)  neutral 
D)  WIMPs 
E)  isochronic

Question 3

How is antimatter created?

Accepted Answer

When two high-energy photons pass near e

Question 4

In the very first phase after the big bang, when the Universe was about a microsecond old, space was filled with____.

Accepted Answer

A)  high-energy photons 
B)  protons and antiprotons 
C)  protons, neutrons, electrons, and positrons (anti-electrons) 
D)  electrons, and positrons (anti-electrons) 
E)  protons, neutrons, electrons 
A)  high-energy photons 
B)  protons and antiprotons 
C)  protons, neutrons, electrons, and positrons (anti-electrons) 
D)  electrons, and positrons (anti-electrons) 
E)  protons, neutrons, electrons

Question 5

Why did the big bang only create hydrogen, helium, and trace amounts of lithium?

Accepted Answer

Atoms with an atomic weight of 5 or 8 ar

Question 6

The Universe has____.

Accepted Answer

A)  an edge, does not have a center, and is finite 
B)  no edge, does not have a center, and is finite 
C)  an edge, has a center, and is finite 
D)  an edge, has a center, and is infinite 
E)  no edge, does not have a center, and is infinite 
A)  an edge, does not have a center, and is finite 
B)  no edge, does not have a center, and is finite 
C)  an edge, has a center, and is finite 
D)  an edge, has a center, and is infinite 
E)  no edge, does not have a center, and is infinite

Question 7

The Hubble time only describes a Universe that is ____.

Accepted Answer

A)  flat 
B)  totally open 
C)  totally closed 
D)  partially open 
E)  partially closed 
A)  flat 
B)  totally open 
C)  totally closed 
D)  partially open 
E)  partially closed

Question 8

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 9

Ordinary matter makes up approximately ____percent of the critical density of the Universe.

Accepted Answer

A)  0.1 
B)  1 
C)  4.5 
D)  10 
E)  50 
A)  0.1 
B)  1 
C)  4.5 
D)  10 
E)  50

Question 10

The flatness problem and the horizon problem can be explained by ____.

Accepted Answer

A)  dark energy 
B)  the inflationary universe hypothesis 
C)  grand unified theories 
D)  the electroweak force 
E)  non-baryonic matter 
A)  dark energy 
B)  the inflationary universe hypothesis 
C)  grand unified theories 
D)  the electroweak force 
E)  non-baryonic matter

Question 11

Briefly describe the steps in the big bang that provided the protons, neutrons, and electrons necessary for nucleosynthesis - the building of complex atoms.

Accepted Answer

In the first phase of the big bang, the

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

Dark matter must be ____.

How is antimatter created?

In the very first phase after the big bang, when the Universe was about a microsecond old, space was filled with____.

Why did the big bang only create hydrogen, helium, and trace amounts of lithium?

The Universe has____.

The Hubble time only describes a Universe that is ____.

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

Ordinary matter makes up approximately ____percent of the critical density of the Universe.

The flatness problem and the horizon problem can be explained by ____.

Briefly describe the steps in the big bang that provided the protons, neutrons, and electrons necessary for nucleosynthesis - the building of complex atoms.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Interstellar Medium

Formation and Structure of Stars

Stellar Evolution

Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies

Supermassive Black Holes and Active Galaxies

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

The Moon and Mercury

Venus and Mars

Jupiter and Saturn

Uranus Neptune Pluto and the Kuiper Belt

Meteorites Asteroids and Comets

Astrobiology

Filters

Exam 18: Modern Cosmology

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

Dark matter must be ____.

How is antimatter created?

In the very first phase after the big bang, when the Universe was about a microsecond old, space was filled with____.

Why did the big bang only create hydrogen, helium, and trace amounts of lithium?

The Universe has____.

The Hubble time only describes a Universe that is ____.

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

Ordinary matter makes up approximately ____percent of the critical density of the Universe.

The flatness problem and the horizon problem can be explained by ____.

Briefly describe the steps in the big bang that provided the protons, neutrons, and electrons necessary for nucleosynthesis - the building of complex atoms.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Interstellar Medium

Formation and Structure of Stars

Stellar Evolution

Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies

Supermassive Black Holes and Active Galaxies

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

The Moon and Mercury

Venus and Mars

Jupiter and Saturn

Uranus Neptune Pluto and the Kuiper Belt

Meteorites Asteroids and Comets

Astrobiology

Filters