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The Big Bang theory states that the universe began as a hot and infinitely dense point, which is only a few millimeters wide—similar to a supercharged black hole. About 13.7 billion years ago, this tiny singularity violently exploded, and from this came matter, energy, space, and time.
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About 4.5 billion years ago, a nearby star exploded, and as the different materials in its region of space collided, it made a planet.
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The Hadeon Eon is the informal division of Precambrian time (began about 4.6 billion years ago), occurring between about 4.6 billion and 4.0 million years ago.
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This was when the formation of Earth, as well as other planets in the solar system, began.
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Approximately 70 million years after Earth formed, an enormous asteroid the size of Mars smashed into Earth, and the materials from both Earth and the asteroid was thrown out into orbit. Over time, this material smashed together to form Moon.
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About 3.9 billion years ago, a hail of meteors attacked Earth. Inside the meteors were crystals that looked like grains of salt, and inside the crystals were minute droplets of water. Although there was only a small amount of water existing in each meteor, as they bombarded Earth over 20 million years, pools of water have grown. As there were puddles of water created on Earth, the Earth's core remained molten, but its surface has cooled enough to form the crust.
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Before, the Moon was so close to Earth, and its gravity was overwhelmed—creating huge ties raced across the planet’s surface. But over time, the Moon moved away, the waves calmed down and the planet started to spin slower. It's predicted that life on Earth began approximately 3.8 billion years ago.
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About 1.5 billion years ago, Earth's inner core formed, and some scientists say that this happened as the inner core 'froze' from the surrounding molten iron outer core.