Question 1

To date,our serious searches for extraterrestrial life have been done almost entirely:

Accepted Answer

A)  in Roswell and Gulf Breeze. 
B)  with radio telescopes. 
C)  with optical telescopes looking for nuclear tests. 
D)  with microwaves in the giant molecular clouds. 
E)  with infrared telescopes looking for greenhouse gases. 
A)  in Roswell and Gulf Breeze. 
B)  with radio telescopes. 
C)  with optical telescopes looking for nuclear tests. 
D)  with microwaves in the giant molecular clouds. 
E)  with infrared telescopes looking for greenhouse gases.

Question 2

The water hole is a region around Sun-like stars where liquid water can exist on the surfaces of terrestrial planets.

Accepted Answer

A) True 
 B)False

Question 3

If we are optimistic in our assumptions about the development of life and intelligence,then the number of technological civilizations in the galaxy should equal the:

Accepted Answer

A)  average lifetime of a civilization. 
B)  number of stars forming per year. 
C)  average number of planets per star. 
D)  number of stars in the galaxy's habitable zone. 
E)  average number of planets that produce life. 
A)  average lifetime of a civilization. 
B)  number of stars forming per year. 
C)  average number of planets per star. 
D)  number of stars in the galaxy's habitable zone. 
E)  average number of planets that produce life.

Question 4

Each factor in the Drake Equation has a well-known,established value.

Accepted Answer

A) True 
 B)False

Question 5

Assuming the conditions ripe for life and intelligence abound in the Galaxy,what factor limits the number of galactic civilizations?

Accepted Answer

A)  the lack of metals for technology 
B)  the number of supernova explosions 
C)  the expansion of the Universe 
D)  the average survival time of the civilizations 
E)  the speed of technological development 
A)  the lack of metals for technology 
B)  the number of supernova explosions 
C)  the expansion of the Universe 
D)  the average survival time of the civilizations 
E)  the speed of technological development

To date,our serious searches for extraterrestrial life have been done almost entirely:

The water hole is a region around Sun-like stars where liquid water can exist on the surfaces of terrestrial planets.

If we are optimistic in our assumptions about the development of life and intelligence,then the number of technological civilizations in the galaxy should equal the:

Each factor in the Drake Equation has a well-known,established value.

Assuming the conditions ripe for life and intelligence abound in the Galaxy,what factor limits the number of galactic civilizations?

Charting the Heavens: The Foundations of Astronomy

The Copernican Revolution: The Birth of Modern Science

Radiation: Information from the Cosmos

Spectroscopy: The Inner Workings of Atoms

Telescopes: The Tools of Astronomy

The Solar System: Comparative Planetology and Formation Models

Earth: Our Home in Space

The Moon and Mercury: Scorched and Battered Worlds

Venus: Earth's Sister Planet

Mars: A Near Miss for Life?

Jupiter: Giant of the Solar System

Saturn: Spectacular Rings and Mysterious Moons

Uranus and Neptune: The Outer Worlds of the Solar System

Solar System Debris: Keys to Our Origin

Exoplanets: Planetary Systems Beyond Our Own

The Sun: Our Parent Star

The Stars: Giants,Dwarfs,and the Main Sequence

The Interstellar Medium: Gas and Dust among the Stars

Star Formation: A Traumatic Birth

Stellar Evolution: The Life and Death of a Star

Stellar Explosions: Novae,Supernovae,and the Formation of the Elements

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: A Spiral in Space

Galaxies: Building Blocks of the Universe

Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

Cosmology: The Big Bang and the Fate of the Universe

The Early Universe: Toward the Beginning of Time

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Exam 28: Life in the Universe: Are We Alone?

To date,our serious searches for extraterrestrial life have been done almost entirely:

The water hole is a region around Sun-like stars where liquid water can exist on the surfaces of terrestrial planets.

If we are optimistic in our assumptions about the development of life and intelligence,then the number of technological civilizations in the galaxy should equal the:

Each factor in the Drake Equation has a well-known,established value.

Assuming the conditions ripe for life and intelligence abound in the Galaxy,what factor limits the number of galactic civilizations?

Charting the Heavens: The Foundations of Astronomy

The Copernican Revolution: The Birth of Modern Science

Radiation: Information from the Cosmos

Spectroscopy: The Inner Workings of Atoms

Telescopes: The Tools of Astronomy

The Solar System: Comparative Planetology and Formation Models

Earth: Our Home in Space

The Moon and Mercury: Scorched and Battered Worlds

Venus: Earth's Sister Planet

Mars: A Near Miss for Life?

Jupiter: Giant of the Solar System

Saturn: Spectacular Rings and Mysterious Moons

Uranus and Neptune: The Outer Worlds of the Solar System

Solar System Debris: Keys to Our Origin

Exoplanets: Planetary Systems Beyond Our Own

The Sun: Our Parent Star

The Stars: Giants,Dwarfs,and the Main Sequence

The Interstellar Medium: Gas and Dust among the Stars

Star Formation: A Traumatic Birth

Stellar Evolution: The Life and Death of a Star

Stellar Explosions: Novae,Supernovae,and the Formation of the Elements

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: A Spiral in Space

Galaxies: Building Blocks of the Universe

Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

Cosmology: The Big Bang and the Fate of the Universe

The Early Universe: Toward the Beginning of Time

Filters