Imagine we could accelerate continuously at 1 g-what we're comfortable with on good old terra firma-to the midpoint of our voyage, and… — Carl Sagan Copy Share Image
What an astonishing thing a book is. It’s a flat object made from a tree with flexible parts on which are imprinted… — Carl Sagan Copy Share Image
There is much that science doesn't understand, many mysteries still to be resolved. In a Universe tens of billions of light-years across… — Carl Sagan Copy Share Image
All of the rocky and metallic material we stand on, the iron in our blood, the calcium in our teeth, the carbon… — Carl Sagan Copy Share Image
We are the product of 4.5 billion years of fortuitous, slow biological evolution. There is no reason to think that the evolutionary… — Carl Sagan Copy Share Image
We on Earth have just awakened to the great oceans of space and time from which we have emerged. We are the… — Carl Sagan Copy Share Image
Even today the most jaded city dweller can be unexpectedly moved upon encountering a clear night sky studded with thousands of twinkling… — Carl Sagan Copy Share Image
A book is made from a tree. It is an assemblage of flat, flexible parts (still called "leaves") imprinted with dark pigmented… — Carl Sagan Copy Share Image
Present global culture is a kind of arrogant newcomer. It arrives on the planetary stage following four and a half billion years… — Carl Sagan Copy Share Image
The Hindu religion is the only one of the world’s great faiths dedicated to the idea that the Cosmos itself undergoes an… — Carl Sagan Copy Share Image
One glance at a book and you hear the voice of another person, perhaps someone dead for 1,000 years. To read is… — Carl Sagan Copy Share Image
After the earth dies, some 5 billion years from now, after it's burned to a crisp, or even swallowed by the Sun,… — Carl Sagan Copy Share Image
There is every reason to think that in the coming years Mars and its mysteries will become increasingly familiar to the inhabitants… — Carl Sagan Copy Share Image
The cosmic calendar compresses the local history of the universe into a single year. If the universe began on January 1st it… — Carl Sagan Copy Share Image
It is all a matter of time scale. An event that would be unthinkable in a hundred years may be inevitable in… — Carl Sagan Copy Share Image
Few scientists now dispute that today's soaring levels of carbon dioxide and other gases in the atmosphere will cause global temperature averages… — Carl Sagan Copy Share Image
For years I've been stressing with regard to UFOs that extraordinary claims require extraordinary evidence. — Carl Sagan Copy Share Image
Eratosthenes's only tools were sticks, eyes, feet, and brains; plus a zest for experiment. With those tools he correctly deduced the circumference… — Carl Sagan Copy Share Image
The beauty of a living thing is not the atoms that go into it, but the way those atoms are put together.… — Carl Sagan Copy Share Image
(When asked merely if they accept evolution, 45 percent of Americans say yes. The figure is 70 percent in China.) When the… — Carl Sagan Copy Share Image
Some 5 billion years from now, there will be a last perfect day on Earth... then the sun will begin to die,… — Carl Sagan Copy Share Image
Centuries hence, when current social and political problems may seem as remote as the problems of the Thirty Years' War are to… — Carl Sagan Copy Share Image
A millennium before Europeans were willing to divest themselves of the Biblical idea that the world was a few thousand years old,… — Carl Sagan Copy Share Image
“Coal, oil and gas are called fossil fuels, because they are mostly made of the fossil remains of beings from long ago.… — Carl Sagan Copy Share Image
Before we invented civilization our ancestors lived mainly in the open out under the sky. Before we devised artificial lights and atmospheric… — Carl Sagan Copy Share Image
What does it mean for a civilisation to be a million years old? We have had radio telescopes and spaceships for a… — Carl Sagan Copy Share Image
You mustn't think of the Universe as a wilderness. It hasn't been that for billions of years," he said. "Think of it… — Carl Sagan Copy Share Image
The near side of a galaxy is tens of thousands of light-years closer to us than the far side; thus we see… — Carl Sagan Copy Share Image
It is sometimes said that scientists are unromantic, that their passion to figure out robs the world of beauty and mystery. But is it… — Carl Sagan Copy Share Image
The prediction of nuclear winter is drawn not, of course, from any direct experience with the consequences of global nuclear war, but rather from… — Carl Sagan Copy Share Image
The suppression of uncomfortable ideas may be common in religion or in politics, but it is not the path to knowledge; it has no… — Carl Sagan Copy Share Image
“Telepathy’ literally means to feel at a distance, just as ‘telephone’ is to hear at a distance and ‘television’ is to see at a… — Carl Sagan Copy Share Image
“On the scale of worlds—to say nothing of stars or galaxies—humans are inconsequential, a thin film of life on an obscure and solitary lump… — Carl Sagan Copy Share Image
Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies,… — Carl Sagan Copy Share Image
In our time, we have sifted the sands of Mars, we have established a presence there, we have fulfilled a century of dreams! — Carl Sagan Copy Share Image
“[ When a religious couple wrote to Sagan about fulfilled prophecies, he wrote back in May 1996 :] If ‘fulfilled prophecy’ is your criterion,… — Carl Sagan Copy Share Image
“Books permit us to voyage through time, to tap the wisdom of our ancestors. The library connects us with the insight and knowledge, painfully… — Carl Sagan Copy Share Image
We live on a hunk of rock and metal that circles a humdrum star that is one of 400 billion other stars that make… — Carl Sagan Copy Share Image
A tiny blue dot set in a sunbeam. Here it is. That's where we live. That's home. We humans are one species and this… — Carl Sagan Copy Share Image
![“[ When a religious couple wrote to Sagan about fulfilled prophecies, he wrote back in May 1996 :] If ‘fulfilled prophecy’ is your criterion, why do you not believe in materialistic science, which has an unparalleled record of fulfilled prophecy? Consider, for example, eclipses.” quote by Carl Sagan](https://sms4smile.com/quotes/img-quotes/875/carl-sagan-160_belief_when-a-religious-couple-wrote-to-sagan-a_25095.jpg)
