The Formation of Solar System
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- The Sun and the planets formed together, 4.6 billion years ago, from a cloud of gas and dust called the solar nebula. 
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- A shock wave from a nearby supernova explosion probably initiated the collapse of the solar nebula. 
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- The Sun formed in the center, and the planets formed in a thin disk orbiting around it.
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- In a similar manner, moons formed orbiting the gas giant planets
- Comets condensed in the outer solar system, and many of them were thrown out to great distances by close gravitational encounters with the giant planets. 
- After the Sun ignited, a strong solar wind cleared the system of gas and dust. The asteroids represent the rocky debris that remained.
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