All civilizations become either spacefaring or extinct.
CARL SAGANIf it can be destroyed by the truth, it deserves to be destroyed by the truth.
More Carl Sagan Quotes
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Extraordinary claims require extraordinary evidence.
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The total number of stars in the Universe is larger than all the grains of sand on all the beaches of the planet Earth.
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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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Other things being equal, it is better to be smart than to be stupid.
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The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
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We can’t help it. Life looks for life.
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Science is an attempt, largely successful, to understand the world, to get a grip on things, to get hold of ourselves, to steer a safe course.
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One glance at a book and you hear the voice of another person, perhaps someone dead for 1,000 years. To read is to voyage through time.
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One of the greatest gifts adults can give – to their offspring and to their society – is to read to children.
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We live on a mote of dust suspended in a sunbeam.
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We all have a thirst for wonder. It’s a deeply human quality. Science and religion are both bound up with it.
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We are star stuff harvesting sunlight.
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Across the sea of space, the stars are other suns.
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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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Those at too great a distance may, I am well are, mistake ignorance for perspective.
CARL SAGAN