a great tree grew up, one with many branches, and six times it was almost felled. But still it grows and we are but one small branch, one that cannot live without its tree. And slowly, we learned to read the book of nature, to learn its laws, to nurture the tree. To find out where and when we are in the great ocean, to become a way for the cosmos to know itself and to return to the stars.

When Carl wrote Cosmos: A Personal Voyage, he imagined an Encyclopedia Galactica-a reference work that includes all the worlds of all the stars. He was bravely writing at a time before a single exoplanet had been discovered and long before the internet. In the decades since, we have located thousands of planets orbiting other stars. His dream of the Encyclopedia Galactica is a little closer to reality now.

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One starry night, as we lay together on the deck of a ship in the Pacific, we spotted a dolphin couple riding the wave off the hull. We watched them for about 10 minutes, when suddenly in a single graceful motion they peeled off the wave at a right angle and disappeared into the deep. They moved in unison as if they had been communicating in some mysterious way. Carl looked at me and smiled: "That's us, Annie," he said. We had 20 years until his death made me a permanent exile from that world we discovered together. I was suicidal. But our children were still young and as their mother I had no choice but to live. So I carried what I learned with Carl inside me and have done my best to keep his flame burning. I rededicated my life to continuing the work we had done together.

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We have known about the dangers we pose to ourselves for decades and yet we continue sleepwalking toward a grim future, somehow numb to what it will mean for our children and theirs. Almost every depiction of our world's future in popular culture is a dystopian vision of a planet piled high with garbage, a ruined wasteland. They are accurate reflections of the fear in our hearts. But if dreams are maps, could a great dream of our future possibly help us find our way out of this nightmare?

These are stories that make me more optimistic about our future. Through them I have come to feel more intensely the romance of science and the wonder of being alive right now, at these particular coordinates in spacetime, less alone, more at home, here in the cosmos.

the possible world that excites me the most-the future we can still have on this one. The misuse of science endangers our civilization, but science also has redemptive powers. It can cleanse a planetary atmosphere overburdened with carbon dioxide. It can set life free to neutralize the toxins that we have scattered so carelessly. In a society that aspires to become a democracy, a conscious and motivated public can will this possible world into existence.

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We all feel the chill our present casts on our future. Some part of us knows that we must awaken to action or doom our children to dangers and hardships we ourselves have never had to face. How do we rouse ourselves and keep from sleepwalking into a climate or a nuclear catastrophe that may not be reversed before it has destroyed our civilization and countless other species? How do we learn to value those things we cannot live without-air, water, the sustaining fabric of life on Earth, the future-more than we prize money and short-term convenience? Nothing less than a global spiritual awakening can transform us into who we must become.

In that photo ("Pale Blue Dot"), the inner meaning of four centuries of astronomical research is suddenly available to all of us at a glance. It is scientific data and art equally, because it has the power to reach into our souls and alter our consciousness. It is like a great book or movie, or any major work of art. It can pierce our denial and allow us to feel something of reality-even a reality that some of us have long resisted. A world that tiny cannot possibly be the center of a cosmos of all that is, let alone the sole focus of its creator. The pale blue dot is a silent rebuke to the fundamentalist, the nationalist, the militarist, the polluter-to anyone who does not put above all other things the protection of our little planet and the life that it sustains in the vast cold darkness. There is no running away from the inner meaning of this scientific achievement.