YearEvent
c. 13.7 billion years ago

Go to Big Bang in A Dictionary of Space Exploration (3 ed.)

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Go to atom in A Dictionary of Astronomy (2 rev ed.)

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c. 13 billion years ago

Go to cosmic abundance of elements in A Dictionary of Earth Sciences (3 ed.)

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c. 12 billion years ago

Go to galaxy in World Encyclopedia (1 ed.)

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c. 4.6 billion years ago

Go to Milky Way in A Dictionary of Space Exploration (3 ed.)

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Go to sun in A Dictionary of Physics (6 ed.)

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c. 4.5 billion years ago

Go to structure of the Earth in Visual English Dictionary (1 ed.)

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c. 4 billion years ago

Go to structure of the Earth in Visual English Dictionary (1 ed.)

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c. 3.5 billion years ago

Go to bacteria in World Encyclopedia (1 ed.)

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c. 3 billion years ago

Go to endosymbiont theory in A Dictionary of Biology (6 ed.)

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