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  • Carl Sagan Quotes   592
  • Science is based on experiment, on a willingness to challenge old dogma, on an openness to see the universe as it really is. Accordingly, science sometimes requires courage - at the very least the courage to question the conventional wisdom.
    • 5 years ago



    Tags : Carl Sagan Quotes , Challenges Quotes , Dogma Quotes
  • There is much that science doesn't understand, many mysteries still to be resolved. In a Universe tens of billions of light-years across and some ten or fifteen billion years old, this may be the case forever. We are constantly stumbling on new surprises
    • 5 years ago



    Tags : Carl Sagan Quotes , Light Quotes , Years Quotes
  • Humans — who enslave, castrate, experiment on, and fillet other animals — have had an understandable penchant for pretending animals do not feel pain. A sharp distinction between humans and 'animals' is essential if we are to bend them to our will, make them work for us, wear them, eat them — without any disquieting tinges of guilt or regret. It is unseemly of us, who often behave so unfeelingly toward other animals, to contend that only humans can suffer. The behavior of other animals renders such pretensions specious. They are just too much like us.
    • 5 years ago



    Tags : Carl Sagan Quotes , Pain Quotes , Regret Quotes
  • All of the rocky and metallic material we stand on, the iron in our blood, the calcium in our teeth, the carbon in our genes were produced billions of years ago in the interior of a red giant star. We are made of star stuff.
    • 5 years ago



    Tags : Carl Sagan Quotes , Stars Quotes , Blood Quotes
  • In the middle 1970s an astronomer I admire put together a modest manifesto called "Objections to Astrology" and asked me to endorse it. I struggled with his wording, and in the end found myself unable to sign, not because I thought astrology has any validity whatever, but because I felt (and still feel) that the tone of the statement was authoritarian.
    • 5 years ago



    Tags : Carl Sagan Quotes , Astrology Quotes , Atheism Quotes
  • Since World War II, Japan has spawned enormous numbers of new religions featuring the supernatural.... In Thailand, diseases are treated with pills manufactured from pulverized sacred Scripture. Witches are today being burned in South Africa.... The worldwide TM [Transcendental Meditation] organization has an estimated valuation of $3 billion. For a fee, they promise to make you invisible, to enable you to fly.
    • 5 years ago



    Tags : Carl Sagan Quotes , Atheist Quotes , War Quotes
  • Because men, compared to male chimps, have such relatively small testicles (large testicles indicate a species where many males mate, one after the other, with the same female), we might guess that promiscuous societies were uncommon in the immediate human past.
    • 5 years ago



    Tags : Carl Sagan Quotes , Past Quotes , Men Quotes
  • Eratosthenes's only tools were sticks, eyes, feet, and brains; plus a zest for experiment. With those tools he correctly deduced the circumference of the Earth, to high precision, with an error of only a few percent. That's pretty good figuring for 2200 years ago.
    • 5 years ago



    Tags : Carl Sagan Quotes , Eye Quotes , Errors Quotes
  • My parents were not scientists. They knew almost nothing about science. But in introducing me simultaneously to skepticism and to wonder, they taught me the two uneasily cohabiting modes of thought that are central to the scientific method.
    • 5 years ago



    Tags : Carl Sagan Quotes , Science Quotes , Two Quotes