Drag the slider, or tap a milestone, to see what life on Earth looked like at any moment from the planet's formation to today.
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Earth's age
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O₂ in air
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Dominant life
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How we know—
Dates follow the 2024 International Chronostratigraphic Chart and recent peer-reviewed work. The LUCA date is from a 2024 molecular-clock reconstruction; the oldest widely accepted body fossils are the 3.48 Gyr Pilbara stromatolites. Atmospheric O₂ values before the Great Oxidation Event are upper limits set by sulfur-isotope evidence. Proterozoic O₂ levels carry wide uncertainty.Sources