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    Items travel around the Sun following Kepler's laws of planetary motion. Each subject orbits along an approximate ellipse with sunlight at one target of the ellipse.

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    In the remaining cloud of gas and dust (the 'solar nebula '), the many planets formed. They're considered to have formed by accretion: the planets began as dust grains in orbit around the central protostar; then obtained by direct contact in to clumps between one and twenty metres in diameter; then collided to create larger bodies (planetesimals) of roughly 5 km in size; then gradually increased by further collisions at roughly 15 cm each year over the The inner Solar System was too hot for unpredictable compounds like water and methane to reduce, and therefore the planetesimals which formed there were relatively small (comprising only 0.6% the mass of the disk )[22] and composed largely of substances with high melting points, such as silicates and metals.

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