This document provides information on the diameters of the planets in our solar system. It lists each planet from largest to smallest diameter, along with some key facts about each planetary body. The largest planets by diameter are Jupiter at 139,832 km and Saturn at 116,464 km. The smallest listed planets are Mercury at 4,878 km and Pluto, now classified as a dwarf planet, at 2,400 km. In addition to diameters, some details are given for each planet's distance from the Sun and characteristics.