Question 1

The main criterion for deciding between Universe geometries is ____.

Accepted Answer

A)  density 
B)  mass 
C)  temperature 
D)  age 
E)  inflation 
A)  density 
B)  mass 
C)  temperature 
D)  age 
E)  inflation

Question 2

What three main observed phenomena are the strongest support for the "big bang" theory?

Accepted Answer

The Hubble law demonstrates that the Uni

Question 3

After nuclear reactions in the big bang had ended, about 25% of the mass of the Universe was in the form of helium nuclei.

Accepted Answer

A) True 
 B)False

Question 4

The Universe is isotropic, but not homogenous.

Accepted Answer

A) True 
 B)False

Question 5

Which statement about the behavior of Universe geometries is correct?

Accepted Answer

A)  Closed and open universes expand forever. 
B)  Closed universes expand and then contract. 
C)  Only flat universes expand forever. 
D)  Flat and open universes expand and then contract. 
E)  Only flat universes expand and then contract. 
A)  Closed and open universes expand forever. 
B)  Closed universes expand and then contract. 
C)  Only flat universes expand forever. 
D)  Flat and open universes expand and then contract. 
E)  Only flat universes expand and then contract.

Question 6

The big bang happened everywhere in the Universe at the same time.

Accepted Answer

A) True 
 B)False

Question 7

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 forever 
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 forever

Question 8

Penzias and Wilson detected microwave radiation because the big bang created ____.

Accepted Answer

A)  shorter wavelength energy that has been redshifted by expansion 
B)  longer wavelength energy that has been redshifted by expansion 
C)  microwave radiation that has not been affected by expansion 
D)  shorter wavelength energy that has been blueshifted by expansion 
E)  longer wavelength energy that has been blueshifted by expansion 
A)  shorter wavelength energy that has been redshifted by expansion 
B)  longer wavelength energy that has been redshifted by expansion 
C)  microwave radiation that has not been affected by expansion 
D)  shorter wavelength energy that has been blueshifted by expansion 
E)  longer wavelength energy that has been blueshifted by expansion

Question 9

Hot gas created during the big bang should be detectable becausethe ____.

Accepted Answer

A)  gas has traveled with galaxies as they formed and is spread through the Universe of the present day 
B)  big bang occurred everywhere at once, and should be visible in any direction at long look-back times 
C)  big bang occurred in a certain location, and the radiation from the gas is concentrated there 
D)  gas has travelled to the edges of the Universe and will be visible at negative redshifts 
E)  radiation emitted by the gas has travelled at the same speed as the expanding Universe and is visible all around us 
A)  gas has traveled with galaxies as they formed and is spread through the Universe of the present day 
B)  big bang occurred everywhere at once, and should be visible in any direction at long look-back times 
C)  big bang occurred in a certain location, and the radiation from the gas is concentrated there 
D)  gas has travelled to the edges of the Universe and will be visible at negative redshifts 
E)  radiation emitted by the gas has travelled at the same speed as the expanding Universe and is visible all around us

Question 10

How is antimatter created?

Accepted Answer

When two high-energy photons pass near e

Question 11

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

The main criterion for deciding between Universe geometries is ____.

What three main observed phenomena are the strongest support for the "big bang" theory?

After nuclear reactions in the big bang had ended, about 25% of the mass of the Universe was in the form of helium nuclei.

The Universe is isotropic, but not homogenous.

Which statement about the behavior of Universe geometries is correct?

The big bang happened everywhere in the Universe at the same time.

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

Penzias and Wilson detected microwave radiation because the big bang created ____.

Hot gas created during the big bang should be detectable becausethe ____.

How is antimatter created?

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

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

The main criterion for deciding between Universe geometries is ____.

What three main observed phenomena are the strongest support for the "big bang" theory?

After nuclear reactions in the big bang had ended, about 25% of the mass of the Universe was in the form of helium nuclei.

The Universe is isotropic, but not homogenous.

Which statement about the behavior of Universe geometries is correct?

The big bang happened everywhere in the Universe at the same time.

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

Penzias and Wilson detected microwave radiation because the big bang created ____.

Hot gas created during the big bang should be detectable becausethe ____.

How is antimatter created?

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

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

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