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The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.

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The Milky Way was formed 10 Billion years ago. Astronomers believe that our own Milky Way galaxy is approximately10 billion years old. The newest galaxy we know of formed only about 500 million years ago.

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Formation. When the solar system settled into its current layout about 4.6 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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Formation. The Sun and the rest of the solar system formed from a giant, rotating cloud of gas and dust called a solar nebula about 4.5 billion years ago. As the nebula collapsed because of its overwhelming gravity, it spun faster and flattened into a disk.

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The first known single-celled organisms appeared on Earth about 3.5 billion years ago, roughly a billion years after Earth formed. More complex forms of life took longer to evolve.

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First Dinosaurs. Approximately 228 million years ago, during the Triassic Period, the dinosaurs appeared, evolved from the reptiles. Plateosaurus was one of the first large plant-eating dinosaurs, a relative of the much larger sauropods.

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Humans first evolved in Africa, and much of human evolution occurred on that continent. The fossils of early humans who lived 1.8 million years ago come entirely from Africa. Most scientists currently recognize some 15 to 20 different species of early humans