The Sun is the Solar System's star and by far its most massive component. Its large mass (332,900 ), which comprises 99.86% of all the mass in the Solar System, produces temperatures and densities in its high enough to sustain nuclear fusion of hydrogen into helium. This releases an enormous amount of , mostly into as peaking in .
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Earth is the third planet from the Sun1. It is the only world in our solar system with liquid water on the surface1. Our solar system consists of the Sun, eight planets, asteroids, and comets2. Earth is the biggest of the terrestrial planets and the fifth largest planet in our solar system3.
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The Solar System formed at least 4.568 billion years ago from the gravitational collapse of a region within a large . This initial cloud was likely several light-years across and probably birthed several stars. As is typical of molecular clouds, this one consisted mostly of hydrogen, with some helium, and small amounts of heavier elements by previous generations of stars.
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