A natural satellite is an object that orbits a planet or other body larger than itself and which is not man-made. Such objects are often called moons. Shown here are 28 of the 240 moons of the Solar System, including those of the dwarf planets Pluto and Eris as well as that of asteroid 243 Ida. The Earth is included for scale.Image credit: NASA, Deuar, TotoBaggins, KFP
 | This picture of the day has been featured on Portal:Solar System. |