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The story of the Milky Way galaxy and the Solar System TIMELINE

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The story of the Milky Way galaxy and the Solar System TIMELINE

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Galaxy formation period

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The Big Bang forms the universe

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Birth of the Sun. The Sun is located in the Milky Way galaxy in a spiral arm called the Orion Spur. The Sun orbits the center of the Milky Way, bringing with it the planets, asteroids, comets, and other objects in our solar system.

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A group of protostars form from a cloud of debris left by prior star explosions in the Milky Way

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The giant planets Jupiter, Saturn, Uranus, and Neptune form around the protosun.

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The Sun begins fusing hydrogen into helium.

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Mercury, Venus, Earth, and Mars form. A Mars-sized planet collides with Earth, and the debris forms the Moon.

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The giant planets' orbits shift, scattering small worlds throughout the solar system. Some bombard the inner planets and likely deliver water and organics to Earth.

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Life begins on Earth

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Mars loses most of its atmosphere and water.

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Photosynthetic organisms evolve on Earth and pump oxygen into our atmosphere, helping create the blend of gases we breathe today.

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An impact on the Moon forms Tycho crater. Saturn gets its rings.

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A giant asteroid impacts Earth, triggering global climate change. Three quarters of life, including the dinosaurs, go extinct.

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The modern human species (called Homo sapiens) arose