The Planets: The Definitive Visual Guide to Our Solar SystemDiscover places where a day is longer than a year, where hailstones are made of diamonds, and where a mountain looms twice the size of Everest. These and more are all to be found in The Planets. The Suns gravity holds in thrall eight planets, each with an entourage of moons, as well as dwarf planets, asteroids, and comets. The Planets takes you on a dazzling visual tour. From the Solar Systems fiery heart, travel to rocky worlds such as tiny Mercury