Terasecond and longer time spans
A terasecond (Ts) equals one trillion seconds (10^12 s), about 31,700 years. Overview of its scale, related larger SI multiples (petasecond to quettasecond), uses, and notable conversions.
A terasecond is a unit of time equal to one trillion seconds (1012 s). In everyday terms a terasecond is roughly 31,700 years, so it spans far longer than recorded human history. The conventional symbol for the terascale prefix combined with the second is Ts; more formally the quantity is 1012 seconds. For a reference definition see this note.
To appreciate the scale, compare a terasecond with smaller and larger SI-derived multiples. A gigasecond (109 s) is on the order of decades, while a terasecond reaches into many millennia. Quantities measured in teraseconds and above are useful when describing geological ages, long-term climate cycles, or astronomical timescales.
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Standard larger multiples
- Petasecond (Ps) — 1015 seconds, about 31.7 million years.
- Exasecond (Es) — 1018 seconds, about 31.7 billion years.
- Zettasecond (Zs) — 1021 seconds, about 31.7 trillion years.
- Yottasecond (Ys) — 1024 seconds, about 31.7 quadrillion years.
- Ronnasecond (Rs) — 1027 seconds, about 31.7 quintillion years (ronna- is a recent SI prefix).
- Quettasecond (Qs) — 1030 seconds, about 31.7 sextillion years (quetta- is the largest SI prefix currently defined).
These conversions use the rough value 1 year ≈ 3.15576×107 seconds, so all year estimates are approximate and rounded for clarity. While the SI system defines prefixes up to quetta-, many practical contexts prefer expressing deep time in familiar units such as years, millions of years (Myr), or billions of years (Gyr).
Practical examples: the age of Earth (~4.5 billion years) corresponds to on the order of 1017 seconds (hundreds of petaseconds), and the age of the observable universe (~13.8 billion years) is likewise several hundred petaseconds. By contrast, a single terasecond already exceeds the span of most cultural and recorded histories.
Notable points: names like terasecond are convenient for emphasizing decimal orders of magnitude in scientific discussion, but they are rarely used in everyday language. For communication outside specialist fields, converting to years, millennia, or named geological units usually gives clearer intuition about the times involved.
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AlegsaOnline.com Terasecond and longer time spans Leandro Alegsa
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