Planet Guide is an astronomy tool that provides a brief amount of information for all the planets. For each planet you can look up a variety of information including atmospheric components, average distance from the Sun, diameter, escape velocity, mass, maximum surface temperature, mean density, orbit eccentricity, orbit inclination, revolution period, rotation period, surface materials, and more. There is also a "planet weight&quot\; calculator that computes your weight on any planet, as well as a notepad section for each planet that lets you enter or cut/paste information about that planet. (This program was formerly known as Planet Watch).