You probably don't need more weapons than what's required to destroy every city on earth. There's only 2,300 cities. So, the United… — 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
If you look at Earth from space you see a dot, that's here. That's home. That's us. It underscores the responsibility to… — Carl Sagan Copy Share Image
Philosophers and scientists confidently offer up traits said to be uniquely human, and the monkeys and apes casually knock them down --… — Carl Sagan Copy Share Image
“If the Earth were as old as a person, a typical organism would be born, live and die in a sliver of… — Carl Sagan Copy Share Image
National boundaries are not evident when we view the Earth from space. Fanatical ethnic or religious or national chauvinisms are a little… — Carl Sagan Copy Share Image
The Platonists and their Christian successors held the peculiar notion that the Earth was tainted and somehow nasty, while the heavens were… — Carl Sagan Copy Share Image
Perhaps, in retrospect, there would be little motivation even for malevolent extraterrestrials to attack the Earth; perhaps, after a preliminary survey, they… — Carl Sagan Copy Share Image
At a few hundred kilometers altitude, the Earth fills half your sky, and the band of blue that stretches from Mindanao to… — Carl Sagan Copy Share Image
“It is pointless to worry about the possible malevolent intentions of an advanced civilization with whom we might make contact. It is… — 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
“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
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
“The Earth is the only world known so far to harbour life. There is nowhere else, at least in the near future,… — Carl Sagan Copy Share Image
“It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of… — Carl Sagan Copy Share Image
An extraterrestrial being, newly arrived on Earth - scrutinizing what we mainly present to our children in television, radio, movies, newspapers, magazines,… — Carl Sagan Copy Share Image
The surface of the Earth is the shore of the cosmic ocean. On this shore, we've learned most of what we know.… — 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
I’m struck again by the irony that spaceflight-conceived in the cauldron of nationalist rivalries and hatreds-brings with it a stunning transnational vision.… — 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
“One consequence of this train of argument is that, even if civilizations commonly arise on planets throughout the Galaxy, few of them… — 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
We've begun at last to wonder about our origins, star stuff contemplating the stars, organized collections of ten billion billion billion atoms… — Carl Sagan Copy Share Image
There is no other species on Earth that does science. It is, so far, entirely a human invention, evolved by natural selection… — Carl Sagan Copy Share Image
The Earth is a very small stage in a vast cosmic arena. Think of the rivers of blood spilled by all those… — Carl Sagan Copy Share Image
“The Apollo pictures of the whole Earth conveyed to multitudes something well known to astronomers: On the scale of the worlds -… — 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
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
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
“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
“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
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
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
“[ 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
“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
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
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
Any sufficiently crisp question can be answered by a single binary digit-0 or 1, yes or no. — Carl Sagan Copy Share
Humans — who enslave, castrate, experiment on, and fillet other animals — have had an understandable penchant for pretending animals do not feel pain.… — Carl Sagan Copy Share
