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|summary=A sober look at space science in intelligent one- or two-page chunks, that teaches you a lot more in its black and white clarity than other books of its ilk.

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There's always a danger in putting a definitive article in the name of a children's non-fiction book title. Luckily enough this volume does go almost as far as making itself definitive, with a lot of numbers and facts, yet a delivery that makes all of those and the theories and terminology it uses all palatable to the browser, and still manages to throw in the redundant unfunny cartoons at the side. In using an intelligent system of going through all the subjects under the broad subject of space, with none of the tables, box-outs and so on other editors choose, this proves one of the more sober, measured and successful books of its kind.