A gigasecond (symbol: Gs) is 1 billion seconds, or roughly 31.7 years. This table lists times of between 1 and 1000 gigaseconds, or between 31.7 and 31,700 years. This timescale encompasses the whole of human history since the time of Cro-Magnon man. ==1–10 gigaseconds== ==10–100 gigaseconds== ==100–1000 gigaseconds== ...
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http://en.wikipedia.org/wiki/Gigasecond
gigasecond (Gs) 1. Human life expectancy about one century is equal to about three Gs. 2. One light-second (distance light travels in one second) about 0.3 Gm.
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http://www.wordinfo.info/words/index/info/view_unit/909/
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