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Given that our solar system is around 4.5 billion years old, why hasn't the gravitational pull of the sun pulled the inner planets to their firey doom yet? Have any of the planets been pulled closer to the sun yet?

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Given that our solar system is around 4.5 billion years old, why hasn't the gravitational pull of the sun pulled the inner planets to their firey doom yet? Have any of the planets been pulled closer to the sun yet?	1