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To help compare orders of magnitude of different times this page lists times between 1015 seconds (a petasecond) and 1016 seconds (32 million years and 320 million years) See also times of other orders of magnitude.
- 250 million years -- One Galactic year - a revolution around the center of the Milky way of our Sun and the Solar system.
Elapsed time
- 34 million years—time since the evolution of the cat.
- 36 million years—time since end of Eocene Epoch and beginning of Oligocene Epoch; age of the Cercopithecidae (Old World primates) superfamily.
- 38 million years—time since the separation of Canidae and Ursidae.
- 40 million years- time since the age of the Catarrhini parvorder. Time since the evolution of the first canines.
- 49 million years—time since the whales returned to the water.
- 50 million years—time since the divergence of cat and dog ancestors.
- 60 million years—time since the evolution of the first primates.
- 65 million years—time since Cretaceous-Tertiary extinction event at end of Cretaceous Period (end of Mesozoic Era) and beginning of Tertiary Period (beginning of Cenozoic Era). Cretaceous mass extinction; end of the age of the dinosaurs.
- 135 million years—time since end of Jurassic and beginning of Cretaceous Period.
- 195 million years—time since end of Triassic and beginning of Jurassic Period; time since the appearance of the earliest mammals.
- 251.4 million years—time since the Permian mass extinction. End of Permian Period and of the Palaeozoic Era. Beginning of Triassic Period, the Mesozoic era and of the age of the dinosaurs.
- 280 million years—time since end of Carboniferous and beginning of Permian Period.
Future time
- 40 million years — estimated period of time until Australia will collide with Asia. Also the estimated time until Mars's moon Phobos will collide with its surface.
Half lives
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