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A leading astronomer and gifted teacher takes readers on a wondrous tour of how science confronts the big questions - about the universe's origins, destiny, and fundamental nature - and how it contends with the limits of our knowledge Humans have learned a lot about the world around us and the universe beyond. We have made powerful insights and created profound theories about the universe and everything in it. Surely the ultimate theory must be waiting, just beyond our current knowledge. Well, maybe. In Into the Unknown, astrophysicist Kelsey Johnson takes us to the edge of scientific understanding about the universe: What caused the Big Bang? What happens inside black holes? Are there other dimensions? She doesn't just celebrate what we know but rather what we don't, and asks what it means if we never find that knowledge.