Extraordinary observations require extraordinary evidence to make them believable. — Carl Sagan Copy Share Image
“Claims that cannot be tested, assertions immune to disproof are veridically worthless, whatever value the may have in inspiring us or in… — carl sagan Copy Share Image
My view is that if there is no evidence for it, then forget about it. An agnostic is somebody who doesn’t believe… — Carl Sagan Copy Share Image
I believe that the extraordinary should be pursued. But extraordinary claims require extraordinary evidence. — Carl Sagan Copy Share Image
You can't convince a believer of anything; for their belief is not based on evidence, it's based on a deep seated need… — 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
Discussing the possibilities of extraterrestrial life: I would love it even if they were short, sullen, grumpy and sexually obsessed. But there… — Carl Sagan Copy Share Image
It's sometimes easier to reject strong evidence than to admit that we've been wrong, this is information about ourselves worth having. — Carl Sagan Copy Share Image
In science it often happens that scientists say, "You know that's a really good argument; my position is mistaken..." — Carl Sagan Copy Share Image
What counts is not what sounds plausible, not what we would like to believe, not what one or two witnesses claim, but… — Carl Sagan Copy Share Image
“Why does Alexander the Great never tell us about the exact location of his tomb, Fermat about his Last Theorem, John Wilkes… — Carl Sagan Copy Share Image
I am not an atheist. An atheist is someone who has compelling evidence that there is no Judeo-Christian-Islamic God. I am not… — Carl Sagan Copy Share Image
“Another of Mack’s patients says that the aliens have been taking eggs from her since she was sexually mature, and that her… — Carl Sagan Copy Share Image
Science arouses a soaring sense of wonder. But so does pseudoscience. Sparse and poor popularizations of science abandon ecological niches that pseudoscience… — Carl Sagan Copy Share Image
For all I know we may be visited by a different extraterrestrial civilization every second Tuesday, but there's no support for this… — Carl Sagan Copy Share Image
After I give lectures-on almost any subject-I am often asked, "Do you believe in UFOs?" I'm always struck by how the question… — Carl Sagan Copy Share Image
“When I wake up I go through an abbreviated process of mourning all over again. Plainly, there’s something within me that’s ready… — Carl Sagan Copy Share Image
In college, in the early 1950s, I began to learn a little about how science works, the secrets of its great success,… — Carl Sagan Copy Share Image
The values of science and the values of democracy are concordant, in many cases indistinguishable. Science and democracy began - in their… — Carl Sagan Copy Share Image
“There is something stunningly narrow about how the Anthropic Principle is phrased. Yes, only certain laws and constants of nature are consistent… — Carl Sagan Copy Share Image
“I'm frequently asked, "Do you believe there's extraterrestrial intelligence?" I give the standard arguments- there are a lot of places out there,… — Carl Sagan Copy Share Image
...the idea of a spiritual part of our nature that survives death, the notion of an afterlife, ought to be easy for… — Carl Sagan Copy Share Image
An atheist is someone who is certain that God does not exist, someone who has compelling evidence against the existence of God.… — Carl Sagan Copy Share Image
An atheist is someone who is certain that God does not exist, someone who has compelling evidence against the existence of God.… — Carl Sagan Copy Share Image
“We are alive and we resonate with idea of life elsewhere, but only careful accumulation and assessment of the evidence can tell… — Carl Sagan Copy Share Image
The evidence, so far at least and laws of Nature aside, does not require a Designer. Maybe there is one hiding, maddeningly… — Carl Sagan Copy Share Image
If some good evidence for life after death were announced, I'd be eager to examine it; but it would have to be… — Carl Sagan Copy Share Image
One of the saddest lessons of history is this: If we’ve been bamboozled long enough, we tend to reject any evidence of… — Carl Sagan Copy Share Image
It seems madness to say, 'We're worried that they're going to become addicted to marijuana' -- there's no evidence whatever that it's… — Carl Sagan Copy Share Image
The neurochemistry of the brain is astonishingly busy, the circuitry of a machine more wonderful than any devised by humans. But there… — 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
