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| c. -13.7bn years ago |
| | | Big Bang, an unimaginably large explosion from an unimaginably small particle - according to modern theory the first moment of the universe | |
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| c. -13.7bn years ago |
| | | Hydrogen and helium nuclei form in the first three minutes, with perhaps another 300,000 years before they combine with electrons to form atoms | |
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| c. -13bn 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. - 12bn years ago |
| | | The first galaxies begin to form, as self-contained gravitational systems with gases gradually coalescing into stars | |
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| c. -4.6bn years ago |
| | | A new galaxy, the Milky Way, forms - and one of its stars is our sun | |
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| c. -4.6bn 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. -4.5bn years ago |
| | | The earth condenses into a solid sphere, with an inner core which is extremely dense and hot | |
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| c. -4bn years ago |
| | | The earth's surface settles into a heaving turmoil of rock and water | |
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| c. -3.5bn years ago |
| | | Fossilized bacteria have been found in rock 3.5 billion years old in Africa | |
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| c. -3bn 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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