Enlarge / Orbiting space station from 2001: A Space Odyssey. (credit: Sunset Boulevard/Corbis via Getty Images)

Off-Earth will amaze you: On nearly every page, it will have your jaw dropping in response to mind-blowing revelations and your head nodding vigorously in sudden recognition of some of your own half-realized thoughts (assuming you think about things like settling space). It will also have your head shaking sadly in resignation at the many immense challenges author Erika Nesvold describes.

But the amazement will win out. Off-Earth: Ethical Questions and Quandaries for Living in Outer Space is really, really good.

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Nesvold is an astrophysicist. She worked at NASA; she can easily run the equations to calculate how much fuel we need to get people, life support, and mining equipment to Mars.