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The universe is a dark forest. Every civilization is an armed hunter stalking through the trees like a ghost, gently pushing aside branches that block the path and trying to tread without sound. Even breathing is done with care. The hunter has to be careful, because everywhere in the forest are stealthy hunters like…
Facts, evidence, reason, logic, an understanding of science -- these are good things. (Applause.) These are qualities you want in people making policy. These are qualities you want to continue to cultivate in yourselves as citizens. (Applause.) That might seem obvious. (Laughter.) That's why we honor Bill Moyers or…
Presumably there is indeed no purpose in the ultimate fate of the cosmos, but do any of us really tie our life's hopes to the ultimate fate of the cosmos anyway? Of course we don't; not if we are sane. Our lives are ruled by all sorts of closer, warmer, human ambitions and perceptions. To accuse science of robbing…
I do not wish here to get into a technical argument about the details of nuclear winter. I will merely summarize my own struggles with the technical issues. I spent a few weeks in 1985 trying to make nuclear winter go away. The phrase "go away" here is used in the sense customary among scientists. To destroy a new…
Most prayers in this room begin with a request to bow your heads. I would like to ask you not to bow your heads. I would like to ask that you take a moment to look around the room at all of the men and women here, in this moment, sharing together this extraordinary experience of being alive and of dedicating ourselves…
I’ve met secular humanists who grew up in evangelical households, for whom Cosmos was their first exposure to a scientific way of viewing the world. Dad was a difference maker. He reached out to people. He took them by the awe and wonder we feel over the most important questions we can think to imagine. He pulled them…
I agree that a dreary comprehensive litany of who made what suggestion and which project official rejected it would be tedious (although me fact that the same idea arose in the minds of many different people - both in the science and the engineering teams - is worth noting), while at least some indication of the…
The adult Sagan always sounded like the smartest person in the room, but in the papers we encounter this interesting note in a 1981 file, right after “Cosmos” hit it big: “I think I’m able to explain things because understanding wasn’t entirely easy for me. Some things that the most brilliant students were able to see…
My professors’ generation could respond to silliness like creationism with head-scratching bemusement. My students cannot afford that luxury. Instead they must become fierce champions of science in the marketplace of ideas. During my undergraduate studies I was shocked at the low opinion some of my professors had of…
Most prayers in this room begin with a request to bow your heads. I would like to ask you not to bow your heads. I would like to ask that you take a moment to look around the room at all of the men and women here, in this moment, sharing together this extraordinary experience of being alive and of dedicating ourselves…
Carl Sagan was an American cosmologist, astronomer, and absolute tireless champion of the sciences in the public sphere. He was the author, co-editor, or editor of almost two dozen science books, and the host the award-winning 1980 television series Cosmos. Sagan was well known for his excitement in talking about…
With Cosmos, Sagan sought to put an end to the fear and to inspire the kind of wonder Hubble's lectures had inspired in the 1930s and 1940s and the Moon landing had inspired in 1969. The series was enormously successful. For the first time since Hubble, a huge audience was engaged in exploring the grand questions of…
I was swimming in a large indoor pool with Peter. When I threw the pool's rubber ball to Peter (as was natural for me to have done), he dove under the ball as it hit the water and batted it with his snout accurately into my hands. After a few throws and precision returns, Peter's returns became increasingly inaccurate…
Sex and death evolved – processes that vastly increased the rate of natural selection. Some organisms evolved hard parts, climbed onto, and survived on the land. The pace of production of more complex forms accelerated. Flight evolved. Enormous four-legged beasts thundered across the steaming jungles. Small beasts…
Venus thus seems to be a place quite different from the Earth, and alarmingly unappealing: Broiling temperatures, crushing pressures, noxious and corrosive gases, sulfurous smells, and a landscape immersed in a ruddy gloom. Curiously enough, there is a place astonishingly like this in the superstition, folklore and…
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. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to…
I believe in evidence. I believe in observation, measurement, and reasoning, confirmed by independent observers. I'll believe anything, no matter how wild and ridiculous, if there is evidence for it. The wilder and more ridiculous something is, however, the firmer and more solid the evidence will have to be.
I have a tolerance for ambiguity. It's clear to me that there's some questions that humans don't have the answers to and what arrogance to imagine we have answers to all questions. Science is sometimes, I know, attacked for supposed arogance, but I think it's the most humble occupation and discipline around. Because…
When I was little, starting about eight, nine, 10, science fiction held enormous fascination. I couldn't read textbooks, or atleast I didn't have access to textbooks that I could read, but there was a lot of science in science fiction and it was rippling with the sense of wonder. But as I got older, and could learn…
I think it's impossible to be a scientist and to confront, even occassionally, the grandure, subtlety, elegance and magnificience of the universe without feeling a sense of reverence and awe, but that's very different from concluding that there's a god who issues punishments and rewards after your dead or that prayer…