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The Solar System consists of the Sun and its planetary system of eight planets, their moons, and other non-stellar objects.
It formed 4.6 billion years ago from the collapse of a giant molecular cloud.
The four smaller inner planets, Mercury, Venus, Earth and Mars, also called the terrestrial planets, are composed of rock and metal. The four outer planets, called the gas giants.
The two largest, Jupiter and Saturn, are composed mainly of hydrogen and helium
The two outermost planets, Uranus and Neptune, are composed largely of substances called ices, such as water, ammonia and methane.
All planets have almost circular orbits that lie within a nearly flat disc called the ecliptic plane.
The two largest, Jupiter and Saturn, are composed mainly of hydrogen and helium.