Solar System  

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The Solar System is the gravitationally bound system of the Sun and the objects that orbit it. It was formed 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc. The Sun is a main-sequence star, where hydrogen in its core is fused into helium. Most of fusion energy is released into space as electromagnetic radiation (light) and neutrinos.

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