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It is the responsibility of scientists never to suppress knowledge, no matter how awkward that knowledge is, no matter how it may bother those in powe...more

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We've arranged a civilization in which most crucial elements profoundly depend on science and technology. We have also arranged things so that almost ...more

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The suppression of uncomfortable ideasmay be common in religion and politics, but it is not the path to knowledge; it has no placein the endeavor of s...more

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Does trying to understand the universe at all betray a lack of humility? I believe it is true that humility is the only just response in a confrontati...more

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All that we have seen is something of a vast and intricate and lovely universe. There is no particular theological conclusion that comes out of an exe...more

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The hole in the ozone layer is a kind of skywriting. At first it seemed to spell out our continuing complacency before a witch's brew of deadly perils...more

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The major religions on the Earth contradict each other left and right. You can't all be correct. And what if all of you are wrong? It's a possibility,...more

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National boundaries are not evident when we view the Earth from space. Fanatical ethnic or religious or national chauvinisms are a little difficult to...more

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For thousands of years humans were oppressed— as some of us still are— by the notion that the universe is a marionette whose strings are pulled by a g...more

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Books permit us to voyage through time, to tap the wisdom of our ancestors. The library connects us with the insight and knowledge, painfully extracte...more

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The size and age of the Cosmos are beyond ordinary human understanding. Lost somewhere between immensity and eternity is our tiny planetary home. In a...more

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Those at too great a distance may, I am well are, mistake ignorance for perspective.

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The significance of our lives and our fragile planet is then determined only by our own wisdom and courage. We are the custodians of life's meaning. W...more

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A blade of grass is a commonplace on Earth; it would be a miracle on Mars. Our descendants on Mars will know the value of a patch of green. And if a b...more

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The Cosmos extends, for all practical purposes, forever. After a brief sedentary hiatus, we are resuming our ancient nomadic way of life. Our remote d...more