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10 Hygiea
Diameter: 269 miles (433 km)
Hygiea is the fourth largest asteroid in our Solar System, located in the main asteroid belt between Mars and Jupiter. It has a diameter of approximately 269 miles (433 km), making it the 10th largest asteroid discovered. Hygiea is a primitive carbonaceous asteroid and is thought to be the largest main-belt object that is nearly spherical in shape. It was discovered in 1910 by the Italian astronomer Annibale de Gasparis. Hygiea is composed of a mixture of rock and ice. It is believed to contain several times the mass of all the other asteroids combined.
