Carl Sagan Quotes on the Cosmos: 23 Lines and Where They Come From

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23 Quotes About Our Cosmos By The Astronomer Carl Sagan

Most of the Carl Sagan quotes people share about the cosmos come from a handful of places: the 1980 television series Cosmos and its companion book, Pale Blue Dot (1994), The Demon-Haunted World (1995), Broca's Brain (1979), his novel Contact and the essays collected in Billions & Billions. A few of the most popular lines, though, were never his at all, or come from a film script or a magazine writer. Below are the 23 lines this page has long collected, grouped by theme, explained in plain language and checked against their sources.

Who Carl Sagan was

Carl Sagan was born in Brooklyn, New York, on 9 November 1934 and died in Seattle on 20 December 1996, aged 62, of pneumonia after a long illness with myelodysplasia. He spent most of his career at Cornell University, where he directed the Laboratory for Planetary Studies and became the David Duncan Professor of Astronomy and Space Sciences in 1976.

His early research helped show that Venus is extremely hot at the surface and that a runaway greenhouse effect is the likely reason; NASA's Mariner 2 flyby in 1962 backed that conclusion. He also put together the gold-plated plaque carried by Pioneer 10 in 1972 and helped assemble the Voyager Golden Record launched in 1977, two attempts to say "this is who we are" to anyone who might one day find the spacecraft.

To the public he was above all a teacher. The Dragons of Eden won the 1978 Pulitzer Prize for General Nonfiction. He co-founded The Planetary Society in 1980. And the 13-part PBS series Cosmos: A Personal Voyage, written with Ann Druyan and Steven Soter, first aired from September to December 1980, won Emmy and Peabody awards, and has been broadcast in more than 60 countries to an audience estimated at over 500 million people.

Lines from Cosmos: we are part of the universe

The best-known group of quotes comes from Cosmos, both the series and the book. Their common thread is that human beings are not observers standing outside nature but a product of it.

  • No. 1, on how rare each person is. Sagan argues that, seen from a cosmic distance, every individual is irreplaceable, so we should let people who disagree with us live in peace: search a hundred billion galaxies and you would not find another of them.
  • No. 2, on star-stuff. The elements in our bodies, such as the nitrogen in DNA, calcium in teeth and iron in blood, were forged inside earlier generations of stars and scattered when those stars died. This is mainstream astrophysics, not poetry: almost every atom heavier than hydrogen and helium was made in stellar cores or in stellar explosions.
  • No. 3, the apple pie. In episode 9, "The Lives of the Stars", Sagan uses a pie as the starting point for a lesson about atoms. His famous line is: "If you wish to make an apple pie from scratch, you must first invent the universe." Truly from scratch means starting with the origin of the elements.
  • No. 9, the universe knowing itself. This is usually credited to the first episode, "The Shores of the Cosmic Ocean". It joins the star-stuff idea to a further thought: since we are made of the cosmos and can think about it, we are one of the ways it becomes aware of itself.
  • No. 17, on books. In episode 11, "The Persistence of Memory", Sagan marvels that marks on a page let us hear someone who may have died a thousand years ago. Reading, in his phrase, is a kind of time travel.
  • No. 22, on imagination. Commonly sourced to Cosmos, it balances his scepticism: imagination can lead us to worlds that do not exist, yet without it we would never get anywhere new.

No. 19: the Pale Blue Dot

The longest entry is the passage from Pale Blue Dot: A Vision of the Human Future in Space (1994). It describes a real photograph. On 14 February 1990, as part of a "Family Portrait" of the Solar System, Voyager 1 turned its camera back from about 6 billion kilometres away. Earth appears as a speck covering less than a pixel, caught in a band of scattered sunlight. Sagan had pushed for years for the picture to be taken, and NASA released a cleaned-up version, "Pale Blue Dot Revisited", for its 30th anniversary in 2020.

The passage is worth reading in full in the book. Its argument runs in three steps. First, everyone who has ever lived, every king, saint, tyrant and child, lived on that one dot. Second, the wars fought to control a fraction of it look absurd from that distance. Third, since no one is coming to rescue us and we cannot yet move anywhere else, the only sensible response is to treat each other more kindly and to protect the one home we have. It turns a grainy image into a moral argument.

Science, doubt and the baloney detection kit

Several lines come from Broca's Brain and from The Demon-Haunted World: Science as a Candle in the Dark (1995), written partly with Ann Druyan. That book teaches readers to tell science from pseudoscience and includes his "baloney detection kit": seek independent confirmation, weigh several explanations, prefer the simpler one, and ask whether a claim could even in principle be shown false.

  • No. 6 says he would rather understand the universe as it really is than hold on to a comforting illusion.
  • No. 7 describes how hard it is to admit that we have been fooled: once a con has taken hold, people often reject the very evidence that would free them, and a charlatan who gains power over someone rarely gives it back.
  • No. 8 answers the "they laughed at Galileo" defence. Some mocked people turned out to be geniuses, Sagan notes, but being mocked proves nothing, since people also laughed at Bozo the Clown.
  • No. 16 argues that a bad argument should be met with a better one, not with censorship.
  • No. 20 is the principle now known as the Sagan standard: "Extraordinary claims require extraordinary evidence." He said it in a 1977 Washington Post interview and used it in Broca's Brain and in episode 12 of Cosmos, about claims of alien visitors. The idea is older: the sociologist Marcello Truzzi wrote of "extraordinary proof" in 1975, and David Hume and Pierre-Simon Laplace made similar points in the 18th and 19th centuries.
  • No. 23 suggests measuring progress by how brave our questions are, how deep our answers go, and whether we choose what is true over what feels good. It is widely shared as Sagan's, but we could not confirm the exact source, so treat it as attributed.

Religion, death and awe

Sagan described himself as an agnostic rather than an atheist, and he wrote about religion with more curiosity than hostility. In No. 4, from Pale Blue Dot, he asks why so few faiths have looked at the universe revealed by science and declared it grander than their prophets imagined, and he wonders whether a religion built on that grandeur could tap a deep sense of reverence. No. 5, from The Demon-Haunted World, makes the same point from the other side: science, he says, does not just coexist with spiritual feeling but can be one of its richest sources.

No. 13 comes from Billions & Billions, the essays he finished during his final illness. He admits he would love to believe that some remembering part of him survives death, but says he knows of nothing to show this is more than wishful thinking. It is a striking example of the honesty he asked of others, applied to the question that mattered most to him at that moment.

No. 21 comes from his last television interview, with Charlie Rose on 27 May 1996. Asked about science and faith, he contrasts a scientist who accepts whatever the universe teaches with someone who treats every word of a holy book as literal truth, and asks which of the two is really the humble one.

Lines from Contact: the novel and the film

Three entries come from Contact, Sagan's 1985 novel about a radio astronomer, Ellie Arroway, who detects a message from another civilisation. It was filmed in 1997 with Jodie Foster, a few months after his death.

  • No. 10 appears in the novel: "For small creatures such as we the vastness is bearable only through love."
  • No. 11, about the universe being an awful waste of space if we are alone, is best known from the 1997 film, where it is spoken by Ellie and her father.
  • No. 12 is film dialogue too. The alien presence, appearing to Ellie in the form of her late father, tells her that humans are capable of both beautiful dreams and terrible nightmares, and that the one thing that makes the emptiness bearable is each other. The screenplay was written by James V. Hart and Michael Goldenberg from a story by Sagan and Ann Druyan, so the wording belongs to the screenwriters as much as to Sagan.

Quotes with complicated origins

Some of the most shared lines on this list need a note.

  • No. 14, "I don't want to believe, I want to know". It fits Sagan's outlook, but no reliable source traces this wording to his books or recorded interviews. Treat it as often attributed to him.
  • No. 15, on cannabis. This one is genuine but was published under a false name. In 1969 Sagan wrote an essay as "Mr. X" for Harvard psychiatrist Lester Grinspoon's book Marihuana Reconsidered (1971), describing his own occasional use and calling the drug's illegality outrageous. His authorship was confirmed only after his death, in Keay Davidson's biography Carl Sagan: A Life. Laws on cannabis vary widely by country and state.
  • No. 18, "Somewhere, something incredible is waiting to be known". Probably not Sagan's words. The quote researcher Garson O'Toole traced it to a 1977 Newsweek profile, where it appears in the magazine's own narration without quotation marks. A reporter or editor most likely wrote it, and later readers credited it to the man in the story.

How to check a Sagan quote yourself

His warm, cosmic style is easy to imitate, so misattributions are common. A few habits help:

  • Look for a specific book, chapter or Cosmos episode. "Carl Sagan" with no source is a warning sign.
  • Separate the novel Contact from the film; much of the film dialogue was written by screenwriters.
  • Be careful with very short, poster-friendly lines. The more a quote sounds like a slogan, the more likely it was polished or invented by someone else.
  • Apply his own standard: the bigger the claim about who said what, the stronger the evidence should be.
Carl Sagan's Books:

Sources: Wikipedia: Carl Sagan; Wikipedia: Cosmos: A Personal Voyage; Wikipedia: The Demon-Haunted World; Wikipedia: Pale Blue Dot; NASA: Voyager 1's Pale Blue Dot; Wikipedia: Sagan standard; Wikipedia: Contact (1997 film); IFLScience: Carl Sagan's essay as "Mr. X"; Garson O'Toole, American Dialect Society list (2013), on the Newsweek line; Quotepark: Charlie Rose interview, 27 May 1996.

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