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Nature timeline

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Matter-dominated
era

Accelerated expansion

Single-celled life

Multicellular
life

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Earliest Universe

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Earliest quasar / sbh

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Andromeda Galaxy

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Milky Way spirals

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NGC 188 star cluster

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Earth / Solar System

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Earliest oxygen

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Atmospheric oxygen

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Sexual reproduction

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Earliest animals / plants

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Cambrian explosion

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Earliest mammals

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Earliest apes / humans

(billion years ago)