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Early solar system, illustration
Early solar system. Computer illustration of asteroids (rocks) orbiting the Sun (centre) in the early solar system. The Sun formed from a collapsing nebula and the remaining dust and gas formed a rotating disc surrounding it. Slow gravitational attraction (accretion) of small particles formed these rocky asteroids (planetesimals). They in turn clumped together to form Earth-like rocky planets, or remained scattered like the present-day asteroid belt.
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