Moon is 451 billion years ago the age of the earth

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Moon is ~4.51 billion years ago. The age of the Earth and the Solar System determined by age dating meteorites using unstable Uranium decay chain
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Many things had to go right to go from the hell that was the early Earth to this hospitable place.
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Early Solar System was full of ‘junk’ of various sizes. As Earth grew, its increasing gravitational pull attracted meteorite bombardment. Intense meteorite bombardment continued through 3.9 billion years ago Later on, meteorite impacts become more rare but do continue, otherwise we’d look like dinosaurs.
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When Earth was only ~30 million years old, it collided with a Mars-sized planet. This produced the Moon. Moon stabilized Earth’s rotation axes and, thereby, Earth’s climate. When it formed, it was ~20 times closer (and bigger) than today. Earth was spinning fast (day lasted 4 hours) and Moon was orbiting very fast as well, making ‘months’ short. Moon is moving away at about 1.5 inch per year and Earth is slowing down, as the result of tidal energy dissipation.
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Around 4.5 b.y. ago, the earth had as much as five times the amount of radioactive heat production as now. Early heating was so intense as to completely melt the earth for a short while. A distinct core and mantle formed by 4.5 b.y. ago while the earth’s surface was covered by an immense ocean of magma.
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Differentiation of the Earth: Iron Catastrophe - A distinct core and mantle formed by 4.5 b.y. ago while the earth’s surface was covered by an immense ocean of magma.
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