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: Space opens 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: Space answers the questions young readers want to know.