To help compare orders of magnitude of different times this page lists times between 10¹⁷ seconds and 10¹⁸ seconds (3.2 and 32 billion years) See also times of other orders of magnitude.

• Shorter times

• 4.32 billion years: one kalpa, or half a day in the lifetime of Brahma, in Hindu mythology. ^[1]
• 10 billion years: expected main sequence lifetime of a G2 dwarf star (like the Sun)

[edit] Elapsed time

• 3.9 to 4.1 billion years: age of oldest cellular life (cyanobacteria)
• 3.7 to 3.9 billion years: age of the Mare Imbrium, the Lower Imbrian epoch
• 4.5 billion years: age of the Earth (see: Precambrian)
• 13.2 billion years: age of the oldest known star, HE 1523-0901
• 13.7 ± 0.2 billion years (4e17 seconds): estimated age of the universe according to the Big Bang theory

[edit] Future time

• 3.6 billion years: estimated time until Neptune's moon Triton will fall through the planet's Roche sphere, potentially disintigrating into a new planetary ring system.
• 5.4 billion years: time before the Sun becomes a red giant
• 20 billion years: time until the end of the universe in the Big Rip scenario

[edit] Half lives

• 4.468 billion years: half-life of uranium-238

• Longer times

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