Ryder System, Inc. History. Ryder System, Inc. was founded in 1933 by James Ryder as a concrete hauling company with one truck. The business expanded quickly into leasing trucks to other companies, under the name Ryder Truck Rental.
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.
Details in the orbits of the outer moons reveal that Charon has approximately 12.18% of the mass of Pluto. This shows it to have a density of 1.702 Â± 0.021 g/cm 3, suggesting a composition of 55 Â± 5% rock to 45% ice, whereas Pluto is somewhat denser and about 70% rock.