The universe seems neither benign nor hostile, merely indifferent.Carl Sagan
Absence of evidence is not evidence of absence.Carl Sagan
We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology.Carl Sagan
It is far better to grasp the universe as it really is than to persist in delusion, however satisfying and reassuring.Carl Sagan
The dangers of not thinking clearly are much greater now than ever before. It’s not that there’s something new in our way of thinking – it’s that credulous and confused thinking can be much more lethal in ways it was never before.
We’ve arranged a civilization in which most crucial elements profoundly depend on science and technology.Carl Sagan
There is a wide, yawning black infinity. In every direction, the extension is endless; the sensation of depth is overwhelming. And the darkness is immortal. Where light exists, it is pure, blazing, fierce; but light exists almost nowhere, and the blackness itself is also pure and blazing and fierce.Carl Sagan
When you make the finding yourself – even if you’re the last person on Earth to see the light – you’ll never forget it.Carl Sagan
For small creatures such as we the vastness is bearable only through love.
I can find in my undergraduate classes, bright students who do not know that the stars rise and set at night, or even that the Sun is a star.Carl Sagan
All of the books in the world contain no more information than is broadcast as video in a single large American city in a single year. Not all bits have equal value.Carl Sagan
The universe is not required to be in perfect harmony with human ambition.Carl Sagan
Who are we? We find that we live on an insignificant planet of a humdrum star lost in a galaxy tucked away in some forgotten corner of a universe in which there are far more galaxies than people.Carl Sagan
I am often amazed at how much more capability and enthusiasm for science there is among elementary school youngsters than among college students.Carl Sagan
Science is a way of thinking much more than it is a body of knowledge.Carl Sagan
The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.Carl Sagan
If you wish to make an apple pie from scratch, you must first invent the universe.Carl Sagan
For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring.Carl Sagan
Skeptical scrutiny is the means, in both science and religion, by which deep thoughts can be winnowed from deep nonsense.Carl Sagan
If we long to believe that the stars rise and set for us, that we are the reason there is a Universe, does science do us a disservice in deflating our conceits?Carl Sagan
But the fact that some geniuses were laughed at does not imply that all who are laughed at are geniuses. They laughed at Columbus, they laughed at Fulton, they laughed at the Wright Brothers. But they also laughed at Bozo the Clown.Carl Sagan
A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism.Carl Sagan
We have also arranged things so that almost no one understands science and technology. This is a prescription for disaster. We might get away with it for a while, but sooner or later this combustible mixture of ignorance and power is going to blow up in our faces.Carl Sagan
Imagination will often carry us to worlds that never were. But without it we go nowhere.
Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works.Carl Sagan
Personally, I would be delighted if there were a life after death, especially if it permitted me to continue to learn about this world and others, if it gave me a chance to discover how history turns out.
Extinction is the rule. Survival is the exception.Carl Sagan
Our posturings, our imagined self-importance, the delusion that we have some privileged position in the universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark.Carl Sagan
The professed function of the nuclear weapons on each side is to prevent the other side from using their nuclear weapons. If that’s all it is, then we’ve gotta as: how many nuclear weapons do you need to do that?Carl Sagan
It’s been said that astronomy is a humbling and, I might add, a character-building experience.Carl Sagan
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 States, by that criteria, only needs 2,300 nuclear weapons – well, we’ve got more than 25,000!Carl Sagan
The Earth is a very small stage in a vast cosmic arena.
We’re in very bad trouble if we don’t understand the planet we’re trying to save.Carl Sagan
No other planet in the solar system is a suitable home for human beings; it’s this world or nothing. That’s a very powerful perception.Carl Sagan
Even these stars, which seem so numerous, are as sand, as dust – or less than dust – in the enormity of the space in which there is nothing.Carl Sagan
We are not without empathetic terror when we open Pascal’s ‘Pensees’ and read, ‘I am the great silent spaces between worlds.’Carl Sagan
We hunger to understand, so we invent myths about how we imagine the world is constructed – and they’re, of course, based upon what we know, which is ourselves and other animals. So we make up stories about how the world was hatched from a cosmic egg or created after the mating of cosmic deities or by some fiat of a powerful being.Carl Sagan
Today, we’re still loaded down – and, to some extent, embarrassed – by ancient myths, but we respect them as part of the same impulse that has led to the modern, scientific kind of myth. But we now have the opportunity to discover, for the first time, the way the universe is in fact constructed as opposed to how we would wish it to be constructed.Carl Sagan
In our obscurity – in all this vastness – there is no hint that help will come from elsewhere to save us from ourselves. It is up to us.Carl Sagan
We are the representatives of the cosmos; we are an example of what hydrogen atoms can do, given 15 billion years of cosmic evolution.Carl Sagan
The boundary between space and the earth is purely arbitrary. And I’ll probably always be interested in this planet – it’s my favorite.Carl Sagan
I’ve written a number of books that have to do with the evolution of humans, human intelligence, human emotions.Carl Sagan
We start out a million years ago in a small community on some grassy plain; we hunt animals, have children, and develop a rich social, sexual, and intellectual life, but we know almost nothing about our surroundings.
Most of the people that I deal with are human. So I’ve had a lot of experience with that.Carl Sagan
Who is Carl Sagan?
Astronomer Carl Sagan researched planets and theories of extraterrestrial intelligence at chicago’s university.
He was named director of Cornell’s Planetary Studies Laboratory in 1968 and served on numerous projects with NASA.
An anti-nuclear protester, in 1983 Sagan initiated the “cold winter” concept. He has published a novel, several books and scholarly papers and the 2014 revived television series, Cosmos.