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Clumps of dust collide into each other and form large objects that orbit the sun.
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A large planet the size of Mars hits the earth, sending debris into space that forms the Moon.
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Asteroids crash into earth, disposing metal into the core of the earth.
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Much of the surface of the Earth is solidified.
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Planets migrated towards the Sun and back out, it is believed that meteors hit the Earth, bringing water with them that formed pools on the surface.