The definition of a finger is a digit on your hand or anything that looks like or functions like a finger. Thumb - The thumb is the short, stubby finger that can rotate in all directions (opposable thumb). The anatomical name for the thumb is the 1st finger.
Pluto is thought to be made of mostly ice. It probably also has a small rocky core which might contain some metals. The ice on the surface of Pluto is made of frozen nitrogen, methane and carbon monoxide. The ice covering Pluto reflects a lot of sunlight making it appear brighter than it would if it had been covered with a darker rocky material. 1  Javascript must be enabled to use Cool Cosmos.
Pluto is a dwarf planet in the Solar System. Its formal name is 134340 Pluto. The dwarf planet is the ninth-largest body that moves around the Sun. At first, Pluto was called a planet. Now, it is the largest body in the Kuiper belt. Like other members of the Kuiper belt, Pluto is mainly made of rock and ice.