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The Earth is the only world known so far to harbor life.

Carl Sagan

Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works.
CARL SAGAN

Awake Citizen Deserve Mind Species Understand Work World
We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology.
CARL SAGAN

Dependent Exquisite Live Science Society Technology
A galaxy is composed of gas and dust and stars – billions upon billions of stars. Every star may be a sun to someone.
CARL SAGAN

Compose Dust Galaxy Gas Stars Sun
The Earth is the only world known so far to harbor life.
CARL SAGAN

Earth Harbor Life
We live on a mote of dust suspended in a sunbeam.
CARL SAGAN

Dust Live Sun Suspend
Imagination will often carry us to worlds that never were, but without it we go nowhere.
CARL SAGAN

Business Carry Imagination Inspirational World
What an astonishing thing a book is.
CARL SAGAN

Astonish Book One Liner
I’ve always thought an agnostic is an atheist without the courage of his convictions.
CARL SAGAN

Atheist Conviction Courage
One of the great commandments of science is: Mistrust arguments from authority.
CARL SAGAN

Argument Authority Command Greatness Science Trust
Writing is the greatest of human inventions, binding together people, citizens of distant epochs, who never knew one another.
CARL SAGAN

Blind Citizen Distant Greatness Human Invention People Togetherness Writing
We are star stuff harvesting sunlight.
CARL SAGAN

Harvest Stars Stuff Sunlight
A book is made from a tree. It is an assemblage of flat, flexible parts (still called “leaves”) imprinted with dark pigmented squiggles.
CARL SAGAN

Assemble Book Leaf Print Tree
Science is an attempt, largely successful, to understand the world, to get a grip on things, to get hold of ourselves, to steer a safe course.
CARL SAGAN

Attempt Course Ourselves Safe Science Success Understand World
The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff.
CARL SAGAN

Apple Blood Calcium DNA Interior Nitrogen Stars Teeth
We live in a vast and awesome universe in which, daily, suns are made and worlds destroyed, where humanity clings to an obscure clod of rock.
CARL SAGAN

Awesome Cling Destroy Humanity Live Rock Sun Universe Vast World
If I finish a book a week, I will read only a few thousand books in my lifetime, about a tenth of a percent of the contents of the greatest libraries of our time. The trick is to know which books to read.
CARL SAGAN

Book Content Finish Library Lifetime Percent Reading Time Trick Week

The Earth is the only world known so far to harbor life.

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The Earth is the only world known so far to harbor life.

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