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To help compare orders of magnitude of different times this page lists times between 10¹⁶ seconds (320 million years) and 10¹⁷ seconds (3200 million years). See also times of other orders of magnitude.

• Shorter times

• 1 billion years= 1 eon (3.16 × 10¹⁶ seconds)

[edit] Elapsed time

• 340 million years—time since the beginning of the Carboniferous and the end of Devonian period
• 400 million years—time since the beginning of the Devonian and the end of the Silurian period
• 420 million years—time since the first creature took a breath of air
• 435 million years—time since the beginning of the Silurian and the end of the Ordovician period
• 500 million years—time since the beginning of the Ordovician and the end of the Cambrian period
• 540 million years—time since the beginning of the Cambrian and the end of the Precambrian period. Time since the Cambrian explosion and age of the earliest Vertebrates.
• 575 million years— age of the oldest Animal fossils
• 580 million years—time since the end of a possible Snowball Earth ice age
• 600 million years—age of first complex multicelled lifeforms
• 750 million years—time since the beginning of a possible Snowball Earth ice age
• 1.8-2.1 billion years—age of the earliest Eukaryotes
• 2.3 billion years—time since the first known ice age

[edit] Future time

• 1 billion years - point at which the Sun's increasing luminosity will render life on Earth's surface impossible.
• 3.0 billion years—time until the potential Andromeda-Milky Way collision, between the Milky Way and Andromeda galaxies

[edit] Half lives

• 703.8 million years—half-life of uranium-235
• 1277 million years—half-life of potassium-40

• Longer times

v • d • e Orders of magnitude (time), by powers of seconds Negative powers 10−44 s | ... | 10−24 s ... 10−19 s | 10−18 s ... 10−16 s | 10−15 s ... 10−13 s | 10−12 s ... 10−10 s | 10−9 s ... 10−7 s | 10−6 s ... 10−4 s | 10−3 s | 10−2 s | 10−1 s Positive powers 100 s | 10 s | 102 s | 103 s | 104 s | 105 s | 106 s | 107 s | 108 s | 109 s | 1010 s | 1011 s | 1012 s | 1013 s |1014 s | 1015 s | 1016 s | 1017 s | 1 E18 s and longer