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Into the Unknown is a book about astrophysics and physics, but it's also much more than that. It's a book about what we know and how we know it, as well as what we don't know. It looks at the big questions, exploring them, and poking at the limits. Johnson emphasizes that we have to keep asking questions and putting forward ideas, even if right now have no way to fully test them, else we'll never stray off the path of what we already know. In the end, the book does a great job of combining science with some philosophy, particularly the philosophy of how we know things.

The books is structured to ask big questions. After an introductory chapter on "What Is Knowledge?" it continues with chapters including "What Caused the Big Bang?", "What Are Dark Matter and Dark Energy?", "What Happens Inside Black Holes?", "What Is the Nature of Time?", and "Is the Universe Fine Tuned?" As you can see, these are big questions, and we only have partial answers (if even that) to some of them.

Johnson writes in an entertaining and easy to understand style, even when she's describing complicated subjects. She uses some very good examples and analogies to make what she's describing clear, making topics like multiple dimensions easier to visualize than most other sources I've read. She also at times talks about questions she asks her students and homework she gives them, making me wish I really had a teacher like her.

This is a book whose aim is to make you think more deeply about the universe, and I recommend it highly.