how was a planet created
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Formation.
When the solar system settled into its current layout about 4.5 billion years ago, Earth formed when gravity pulled swirling gas and dust in to become the third planet from the Sun.
Like its fellow terrestrial planets, Earth has a central core, a rocky mantle and a solid crust.
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The various planets are thought to have formed from the solar nebula, the disc - shaped cloud of gas and dust left over from the Sun's formation. The currently accepted method by which the planets formed is accretion, in which the planets began as dust grains in orbit around the central protostar.
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