You have to know the past to understand the present.
CARL SAGANThere are as many atoms in one molecule of DNA as there are stars in a typical galaxy.
More Carl Sagan Quotes
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Stars are phoenixes, rising from their own ashes.
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Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies, you will not find another.
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Knowing a great deal is not the same as being smart; intelligence is not information alone but also judgement, the manner in which information is coordinated and used.
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The universe is not required to be in perfect harmony with human ambition.
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One of the great commandments of science is: Mistrust arguments from authority.
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The Earth is the only world known so far to harbor life.
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Every kid starts out as a natural-born scientist, and then we beat it out of them. A few trickle through the system with their wonder and enthusiasm for science intact.
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For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring.
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Books permit us to voyage through time, to tap the wisdom of our ancestors.
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Not explaining science seems to me perverse. When you’re in love, you want to tell the world.
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Except in pure mathematics, nothing is known for certain (although much is certainly false).
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Somewhere, something incredible is waiting to be known.
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We are star stuff which has taken its destiny into its own hands.
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Extraordinary claims require extraordinary evidence.
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Exploration is in our nature. We began as wanderers, and we are wanderers still. We have lingered long enough on the shores of the cosmic ocean. We are ready at last to set sail for the stars.
CARL SAGAN