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| c. 13 billion years ago |
| | As gravity exerts its pressure within parts of the expanding fireball, subnuclear particles merge into more complex elements | |
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| c. 12 billion years ago |
| | The first galaxies begin to form, as self-contained gravitational systems with gases gradually coalescing into stars | |
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| c. 4.6 billion years ago |
| | A new galaxy, the Milky Way, forms - and one of its stars is our sun | |
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| c. 4.6 billion years ago |
| | The new star settles down, while nuclear dust in the vicinity coalesces into planets and asteroids orbiting the sun | |
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| c. 4.5 billion years ago |
| | The earth condenses into a solid sphere, with an inner core which is extremely dense and hot | |
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| c. 4 billion years ago |
| | The earth's surface settles into a heaving turmoil of rock and water | |
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| c. 3.5 billion years ago |
| | Fossilized bacteria have been found in rock 3.5 billion years old in Africa | |
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| c. 3 billion years ago |
| | Single-celled water creatures, such as algae, begin the 2-billion-year process of evolving into slightly more complex forms of life | |
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| c. 1 billion years ago |
| | Sponges and jellyfish drift in the sea, to be joined later by more purposeful shrimps and lobsters | |
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| c. 500 million years ago |
| | The earliest known creature with a skeleton evolves as a form of fish | |
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