The Earth is the only world known so far to harbor life.
CARL SAGANThe beauty of a living thing is not the atoms that go into it, but the way those atoms are put together.
More Carl Sagan Quotes
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We live in a vast and awesome universe in which, daily, suns are made and worlds destroyed, where humanity clings to an obscure clod of rock.
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There are as many atoms in one molecule of DNA as there are stars in a typical galaxy.
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One of the great commandments of science is: Mistrust arguments from authority.
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We make our world significant by the courage of our questions and the depth of our answers.
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Imagination will often carry us to worlds that never were, but without it we go nowhere.
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Science is a way of thinking much more than it is a body of knowledge.
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The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff.
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The universe seems neither benign nor hostile, merely indifferent.
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When we look up at night and view the stars, everything we see is shinning because of distant nuclear fusion.
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Science is a way to not fool ourselves.
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If we ruin the earth, there is no place else to go.
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If I finish a book a week, I will read only a few thousand books in my lifetime, about a tenth of a percent of the contents of the greatest libraries of our time. The trick is to know which books to read.
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What an astonishing thing a book is.
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Arguments from authority carry little weight, authorities have made mistakes in the past. They will do so again in the future. Perhaps a better way to say it is that in science there are no authorities; at most, there are experts.
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You have to know the past to understand the present.
CARL SAGAN