Chris Impey is University Distinguished Professor and Deputy Head of the Department of Astronomy at the University of Arizona in Tucson. He is also the author of The Living Cosmos and How It Ends.
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Planet Earth, it turns out, may not be the best of all possible worlds—and lately humanity has been depleting resources, decimating species, and degrading everything needed for life. Meanwhile, human ingenuity has opened up a vista of habitable worl... SEE MORE