The Solar System consists of the Sun ,eight planets, the moons, and other non-stellar objects. 

It formed approximately 4.6 billion years ago from the collapse of a giant molecular cloud.

The two largest planets  Jupiter and Saturn are composed of hydrogen and helium.

The solar system also consists of  four smaller inner planets named as Mercury, Venus, Earth and Mars also called the terrestrial planets. They are composed of rock and metal. 

The four outer planets called the gas giants, are substantially more massive than the terrestrials. 

The two outermost planets Uranus and Neptune are composed of ice such as water, ammonia and methane and called as "ice giants". 

The Solar System  also consists of asteroid belt which lies between Mars and Jupiter and it is similar to the terrestrial planets as it is composed mainly of rock and metal.

All planets have almost circular orbits that lie within a nearly flat disc called the ecliptic plane. 
Beyond Neptune's orbit lie the Kuiper belt and scattered disc. 

Various other small body populations including comets, centaurs and interplanetary dust freely travel between regions. 

Six of the planets and some of the dwarf planets and smaller bodies are orbited by natural satellites  usually termed "moons" after Earth's Moon. 

Each of the outer planets is encircled by planetary rings of dust and other particles.

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