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.
Mass and Density of Pluto. The mass of Pluto is less than .024 percent than that of earth (1.31Ã10_22 kg). That is roughly seven times (.0021) the mass of Earth. Its diameter is 2,390 km, which is relatively smaller than that of the Earthâs moon.The density on Pluto ranges from 1.8 to 2.1 grams per centimeter cubed.hat is roughly seven times (.0021) the mass of Earth. Its diameter is 2,390 km, which is relatively smaller than that of the Earthâs moon. The density on Pluto ranges from 1.8 to 2.1 grams per centimeter cubed.