The Solar System was formed roughly 4.6 billion years ago. The Solar System makes up of the Sun, planets, dwarf planets, and other objects in its orbit. It formed by the break down of a huge molecular cloud, the mass of the centre collecting to develop the Sun and a flat disk of dust around it which the planets and other astronomical bodies would ultimately be formed from. The Sun is where 99.86% of the System's mass is found. Most of the remaining 0.14% is enclosed within the Solar System's 8 planets. The Terrestrial planets are the four tinier inner planets. Mercury, Venus, Mars, and Earth are principally composed of metal and rock. The ''gas giants'' are the four outer planets, which are Jupiter, Uranus, Saturn, and Neptune. These are considerably bigger and more colossal than the inner planets. Jupiter and Saturn are the two innermost gas giants. They are the bigger of the four and are composed mostly of Helium and Hydrogen. Uranus and Neptune are the two outermost gas giants. They are made up substantially of ices, water, ammonia, and methane. They are commonly referred to as the ''ice giants''. There are the dwarf planets in the Solar System. They are Ceres, Haumea, Makemark, and Eris, Moons, Asteroids, the asteroid belt, comets, and the Kuiper belt. Dwarf planets are round celestial bodies that orbit the Sun. Dwarf planets are not able to clear their orbital path. This means there are no objects that are similar and the same distance from the Sun. A dwarf planet is much tinier than a planet. Pluto was the well recognized Dwarf planet. The asteroid belt is located in a region of space between the orbits of Jupiter and Mars. This means that it is between 2.2 and 3.2 astronomical units (AU) from the Solar Systems Sun. It is considerably large for the average distance between objects in the Asteroid. Asteroid belt objects are composed of rock and stone. There are billions of asteroids in the asteroid belt. The asteroid belt is usually referred to as the ''Main Belt''. This distinguishes it from other groups of asteroids. For instance Centaurs, and Lagrangians.