From marvelous galleries of the Big Dipper, Little Dipper and other constellations to in-depth looks at Mercury, Venus, Earth, Mars, Saturn, Uranus, and Neptune and to the moons of Jupiter, comets, and galaxies -- not to mention entries on rockets and spacecraft --Pocket Genius: Spaceopens up the vast and mysterious expanse of space. What is a nebula? Why does an eclipse occur? How does a telescope work? Featuring more than 170 planets, stars, rockets, and rovers,Pocket Genius: Spaceanswers the questions young readers want to know.Redesigned in paperback, DK's best-selling Pocket Genius series is now available in an engaging compact and economical format that is ideal for both browsing and quick reference for use in school and at home. Catalog entries packed with facts provide at-a-glance information, while locator icons offer immediately recognizable references to aid navigation and understanding, and fact files round off the book with fun facts such as record breakers and timelines. Each pocket-size encyclopedia is filled with facts on subjects ranging from animals to history, cars to dogs, and Earth to space and combines a child-friendly layout with engaging photography and bite-size chunks of text that will encourage and inform even the most reluctant readers.