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The Universe appeared about 13.8 billion years ago which is called the Big Bang. The Big Bang is first of all Historical dates. It is the creation of the universe.

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Gap Between 13.8 billion years and 13.7 billion years ago

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Gap Between 13.8 billion years and 13.7 billion years ago

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There was a 380,000 year gap between the Big Bang and the creation of the first atom. During this period of time nothing historically happened. Scientists think that positive and negative chargers were mixing which is what caused the first atom to be created.

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The forming of the first atoms was the first "phase change." It cooled enough positively charges atoms to bring in negatively charged electrons, which formed the first atoms.  They also call it cosmic background radiation.

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The first stars were created about 200 million years after the Big Bang. They were created by the gravity collected into galaxies with billions of stars. The tug of the gravity was to weak to prevent the expansion, so the universe expanded.

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The first planets were created about 5 billion years ago. They were created by tiny amounts of matter that continued to build up. Now there are 8 planets that are apart of our history.

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The early earth was hot and dangerous and It was bombarded with asteroids and meteoroids. Then eventually the earth was so hot it melted into a process called differentiation. All of the metals ( nickel and iron) melted to the middle of the earth and created the magnetic field. The early earth was hot and dangerous and nothing could live there. The earth now has all types of life forms, and oxygen, and water so we can survive.

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First 500 Million years of Earth (Hadean era)

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First 500 Million years of Earth (Hadean era)

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The first 500 million years of earth were known as the Hadean era. This era was the way beginning of earths early stages. During these 500 million years earth was really hot, it was bombarded with asteroids, and there was no oxygen on the atmosphere. With that being said no living things would be able to survive during this time frame. Water Vapor then began to create vast clouds, which began to run down onto the surface to create the first form of oceans.

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3.5 billion years ago earth created some of the first living organisms. These were formed by many of the first chemicals on early earth. Biologists call these tiny, simple, one celled organisms "prokaryotes." They are still the most common organisms on earth today.

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2 billion years ago the first eukaryotes were created. They were created by some of the first organisms adapting to the oxygen and building their own metabolisms. They first eukaryotes reproduced more into more complex eukaryotes.

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The first swapping of DNA caused a form of reproduction that we call sexual reproduction. This new form of reproduction generates new forms of organisms that can adapt to certain environments. So because of the new stage of reproduction it has created a large variety of living organisms.

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65 million years ago the earliest mammals were burrowing creatures that survived after the dinosaurs were extinct. After time went on the many organisms began to adapt to the environment dinosaurs once roamed.

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About 20 million years ago early forms of apes began to evolve. They spent most of there time living on ground and about 7 million years ago they began to stand up on two legs. These were the first "hominies."

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Homo Sapiens appeared about 250,000 years ago. This is the first evolution of humans. The appearance of humans was different than any other species which is why homo sapiens history is different than others.

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The most famous homine ancestor is Lucy. She was apart of the hominine group known as the "Australopithecus". She lived about 3 million years ago in what is now Ethiopia in Africa. By the way her head and spine was connected she was bipedal, , Mary Leakey is a pioneer of human paleontology and she found footprints in volcanic ash.

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There was another species identified as homo habilis, and they could manufacture different stone tools. They appeared 2 million years ago in east Africa. A half million years later there appeared a species called homo erectus, they were about the same size as us and their brains were around the same size.